Have people already tried to steal from you yet or are you just preparing?
Back to reality...
There is 1 company that I know that sells "DI water" but I have had no luck in actually finding it as of yet but if I do I will be buying that stuff and in bulk, depends on how often I need to refill the 250L storage drum, nothing is in direct sunlight so evaporation shouldn't be out of the ordinary, I hope.
Do you buy your RO/DI water? Why dont you have a filter and make your own?
#1 - Their is very little water pressure here.
#2 - Cannot buy RODI filters here.
#3 - Tap Water is so dirty you would be changing filters out weekly/biweekly.
#4 - RODI filters produce a lot of wasted water which wouldn't fly to well with others here...