Really? 2 gallons in 15-20 minutes? My setup with the 2 gallon pump will easily last at least an hour, maybe closer to an hour and a half. though I don't pump it 20-25 pumps, because they it really goes through a lot of water with that pressure, instead I pump it like 10-15 times, albeit more often, and the 2 gallon tank easily lasts an hour. That is bizarre that yours goes through that much water if our setups are almost identical, because seriously, the 2 gallons lasts 1.5 hours. Considering what time I'm arriving Thursday, by the time I'm set up it will be evening and cooler out anyway, so I probably won't need it at all Thursday. Friday/Saturday/Sunday, I'll probably only use it a little bit in the morning, and then for about an hour each of those days when we are actually back at the campsite for lunch. It sounds like you are going to be using your mister almost constantly, but I honestly think 30 gallons for the entire weekend is a generous estimate for misting and solar showers, for me and my camp spot (4 people). Those giant plastic 5 gallon bottles that you mentioned are a great idea, although I have no idea where to buy them. I may also just get 2 of these collapsing containers, which also hold 5 gallons.
http://www.rei.com/product/708992
Link? Have you used this reflective tarp in the past? I was worried about breath-ability on using tarp, so I was just planning on getting some CHEAP bed sheets ( I figure some cheap low thread-count sheets will basically have like a million little holes for fresh air to seep through, but please correct me if I'm wrong)
Or are bed sheets as EZup walls not that effective and a bad idea?
I have no experience with walls, we only had an EZup last year.
Do you use that tarp on just one side of the EZup? Or all 4 walls? or 2? Or maybe even perhaps 3? Again, I have no experience with walls on the EZup but I feel like 4 is too much (like baking trapped air in an oven) and 1 is too little. Or is it?