it needs to b 6.5-7.5, if its less then 7 its acitiy will eat the roots, if its higher then 7 it can poison the plants with to much minrals. It can range a bit higher or lower, the best way to water it is leve a 5 gallon bucket out full of water n let it sit over night so you know theres no clorine left in it. Then just take water from the bucket when needed. Make shure ur not over watering it can cause worce problems. Gl on the grow. Dont stress bout it Normal tap water normaly works, if ur worried, use bottled water or just souluted.