Posted: 22/06/2013 at 21:58
I collect rain water for blueberry watering but you can use tap water. Depending where you live, tap water can be hard or soft, I don't know what makes water hard or soft, it's possible lime, I'm sure someone will be along shortly to tell us though, but blueberries prefer one to the other although neither is harmful to us.
Rain water is the same where ever you live and blueberries are happy being watered with it. As most do not know whether they have hard or soft tap water, or to what degree, the best advise is to use rain water but if your blueberries are happy with tap water no need to fix something which isn't broken, carry on watering.