Leaves going soft and slightly wilting.

Well now. I don't think I have a huge problem but some of my leaves are slightly going soft and wilting a small bit. I may have a bit of a heat problem but nothing too drastic. On Thursday I went out on the beer and forgot to come home to water my plants, the next morning I got up and had to use tap water, usually I use bottled distilled water. I don't know the PH as I was in a rush to give em a drink. Would this small mishap be the cause of wilting leaves?? This happened only once and wont happen again.
Thanks for help