Wow, sorry to hear it was such a big bite, but I guess that's not too surprising considering the environmental issues that are involved.
As for flushing water, a friend of mine has a pretty cool rainwater collection system at his cabin involving 3 interconnected plastic 55 gallon drums connected to his downspout system. It's pretty nice and he uses it for flushing since they don't have a well on their getaway place. Might be worth considering for the time being.