From the other thread I just replied to I figured that you had high ammonia from your faucet. You said "spring water" in that thread so it's not chloramines if that's the case. At any rate, I still recommend using Prime to neutralize the ammonia.
Not sure why distilled water would be a "no-no" in FW
setups. It's basically pure water as is RO
water but goes through a different process to get there. I wouldn't use JUST distilled water/RO
water in my tanks. The fish/plants/snails/inverts need minerals that are in the water to survive and have a healthy bone structure/shell/exoskeleton. If you use just purified water you will want to add something like Kent RO
Right which puts minerals back into the water.