The healthiest one I had Was accually started in the ag and not a towel.....You don't really need to buy special water. You can get Liquid that takes out clorine and cloramine at the pet store! DO NOT GET ANYTHING WITH A PH BUFFER. It will balance your PH to 7 BAD!!!! You want acidic water...b/w 5 and 6 PH.....The nutes that can with it lower the ph of tap water also. I have tropical fish so I just used thier old water which i filter back through carbon, they loved that stuff. Oh yea and stoners love fish and fish love stoners! Tropical fish keeping skills are very useful in gardening due to water knowledge! Thats where my expertise is, besides I had three very healthy males and a herme,.....using crappy old pot seeds.