Poker,

Your friend had better start reading and researching quick if he wants his plants to make it. Good intentions are NOT going to make those plants grow and be healthy....only time, knowledge and energy.

Tap water....the stuff coming out of your faucet. Use the lemon juice to drop the ph....and check ph carefully. Order some ph up/down off the internet if you have to but you need to do some serious research and get your basics down.

No matter WHERE you get your water you need to check AND adjust ph if necessary...I don't care WHAT kind it is....your faucet, the store, the OCEAN. .ALWAYS check ph of your water and solutions before adding ANYTHING to your plants.

Good luck. I'll be right back with a good link for sick plants for you to look at too.