I make beer to produce co2 in my grow room. The beer ferments for about 2 weeks producing co2 that whole time. when its almost done fermenting just make more beer. I make 5-10 gallons at a time. Its like using the two best things in the world to work together.
pay your electric bill and dont worry about the cops. the only thing thats gonna get you in trouble is running your mouth about your grow to all your friends.
humidity stays pretty good. it is a medical tape with micro pores and i used rye grain for the substrate. Just got a couple prints off these today gonna start some new jars soon.
tap water is fine. its all i use and i dont let it sit out for more than 5 min let alone 24h. But we have good water where i live. so i guess it depends on the quality of your local water.