water types

[mrphilips]

i'm sure there is a post out there on this, but my searches brought up millions, so i'm starting a new one - sorry to repeat.

what water can i use?
originally i just used my city tap water (toronto). seemed ok. then i got a phragmipedium pearcei and was told it needed rain water only, so i started collecting rain water.
i have 4 4L jugs i fill when i get a big rainfall, but as a renter a "rain barrel" or such collection thing is unlikely.

occasionally the rain (or snow) stops long enough that i run myself dry...

i have been told distilled water is disastrous for plants as it actually sucks the nutrients out of the roots.

i can revert to tap water but after spoiling them for so long it stresses me.

what water should i buy to feed them when i run dry?

what i'm feeding:
3 phal noids
1 phrag pearcei (apparently can't tolerate water additives)
1 pahp. rothschildianum
1 brass. dr john
1 enc. bractescens (doesn't drink, just gets misted)