What type of water should i use??

What kind of water is best to use for plants? i have been using tap water and letting it stand for 24 to 48 hours before i use it and also so it can get to room temp..............can you use spring water? or can you use distilled ? but if you use theys do you have to add anything to them ?
Or is tap water just fine enough? I dont know if my tap water is good or not when i have sprayed onto my plants after it dries i have noticed the leaves have a little white residue not alot just barley could be nothing but still asking.......also what about Smart wATER it has electrolytes and calciuum and stuff in it so if you can please help would appreciate it...

Your best option long term is to buy a RO machine. Theyre not too bad, for about $300 I got the machine and a 55 gallon drum to keep water in, including an air stone that will keep the water oxygenated. (Btw, leaving your water out is great for getting rid of some chemicals in the water but also lets the air escape which roots need) If you don't need that much you can get smaller setups too. RO machines are the machine that is used by Pepsi to make aquafina, the idea is that there is as little "stuff" in the water as possible once run through the machine. In my case the water will test having 0-5ppm (parts per million).

If you are doing only a few plants at a time, you can start with distilled or bottled if you would like. Buy the largest thing you can of quality water. Some grocery stores sell "0 water" this is basically RO water they bottle and sell. Home depot sells 5 gallons of absopure water for like $7 plus deposit or exchange, check what your grocery store does for gallons if you are in a large enough city to have a major sized store.

The key is the quality of the water, plants only absorb so much nutrition at a time from water, and having stuff in there that you don't want is inefficient, if you want to test your tap water (for how much "stuff" or ppm it has) you can get a basic tester for about $40 at your local grow store. Dont buy an expensive one, I use the basic one myself and its all you need for a ppm meter.

Im not saying tap water wont keep a plant alive, but just that quality counts for how healthy your plant will be. Healthy plants produce larger and higher potency buds.

Garden hose has worked pretty good for me!

I just bought some water from Smiths it says : Purified drinking water, purified by Reverse Osmosis, Filtered and Ozonated to Ensure Quality its a 2.5 gallon is this good to use on my three girls or is it bad? Also do I need to add anything to it???

I was going through about a gallon of water a day per plant during heavy budding. Just something to think about, thats a lot of water to lug around every day. If you're that worried about stuff in the water just fill up a five gallon bucket and run a fish aerator into it for 24 hours if anything it will keep your water full of oxygen. Unless your water is so hard it's leaving calcium deposits you probably don't have anything to worry about. I grow massive rose bushes every year using the garden hose. There are trace minerals in water that may be benefical to your plants that won't be in the distilled water.

Its not distilled water its purified by reverse osmosis and ozonated just want some water better then tap so thats all im asking will this be ok or does it need more minerals in it or anything?

DO NOT USE RO or DISTILLED. Over the years I have learned that to use RO or any form of purified water is giving your plants only water. Micronutes are terribly important and if you do give RO or distilled you now must add this back in for the plant and these are minute amounts of minerals. Much easier to just use the tap water and the plants prefer it.

Ah, yet again the question is asked....

It's very simple B-LO.... Water source is preference.... Some people live in an area where tap works for them....some don't....

Like WashWonder mentioned, if using RO or Distilled water, micro-nutes will have to be introduced to give the plants the needed trace minerals.... A bottle of Cal-Mag and Liquid Karma will take care of that....

The reason I don't like using tap is because I like to know where all the ppm's come from....and tap water is usually laced with chemicals that kill bacteria....and I like my beneficial bacteria alive and well in my soil, so....RO for me....

CGI::::::

when i switched to tap water, the quality of my buds increased. best advise washwonder every gave me and he didnt know that he did it. also dont worry about letting it sit. just use it

also i have in in a watering jug its been sitting for like a week in open air is this ok ? does it lose any more nutes sitting out for long periods of time?
another question is my AK48 plant is a lighter green then my super skunk and is growing alot slower way slower then my super skunk! can something be wrong with it? and the next set of leaves coming out one leaf is way shorter the other side is normal???????

Your water becomes stagnant and loses oxygen after it sits and your roots need oxygen from the water.

If concerned with your water quality, check online for your local water company's Water Quality Report. Should tell you exactly what ph it is, what's used to chlorinate it, what other crap is in it...

I was living in Vegas for a few years when I was first starting-out. The tapwater there is almost undrinkable and is definately stinky. I'd let it sit out overnight (offgassing the chlorine) and water the plants with it the next day. Never had an issue till we got our R/O unit repaired. The plants prefered the tap water, so I ended-up having to get the water from an outside spiggot. (not hooked-up to the R/O)

Water is 1/3 oxygen to begin with. But letting the water sit-out does lower the available dissolved oxygen. (an oxygen molecule not attached to another element or mineral) However, when you add the water to the soil, air (and oxygen) is pulled-down into the medium through a process called suction. Worrying about oxygenating the water prior to adding to the soil, is, IMHO...a waste of time and effort.

Interesting and informative article about water...:
Common Water Measurements, from USGS Water Science for Schools

Al things 100% similar, the shade or hue of a cannabis leaf can vary from strain to strain, and is controlled by recessive genes, I guess.