I forgot to add, I have not given it any fert. I am using "Garden Magic Potting Soil." The only kind of ingredient list says "Peat Moss, Sand, Perlite 80%." This leads me to wonder what the other 20% is. It says nothing about any fert added. I mixed the soil 2:1 with added perlite because I noticed the soil can be quite compact on its own.

What type of water would you recommend? Tap water left out for a few days? Rain water???