Well, watering from the bottom of the pot is usually only done when you are going to be away and have to use a wick to water your plants.

You'd take a clean bit of nylon rope and embed it into the soil with the end that is IN the pot frayed. Then place the pot, with the other end of the rope hanging down (kinda like a tampon string lol!) into a container of fresh water at correct pH.

I would not put nutes in this water, or use this method unless I went on vacation. Generally, watering to the point of slight runoff is a GOOD thing, as it constantly flushes out unused portions of the fertilizer that could potentially re-combine or interact and harm your plants.

Hope that helps some!