Three days worth of water?!
Whoa.
I think you might need to tote a trailer/water buffalo for that.I'm sure you know more about BoB Trailers than I. Maybe look at portable water containers and tow them? I don't know, have the equipment mailed to a safe location where you can pick it up, and them mail it home after the 3 days.
This company makes custom water bladders for water. The smallest size is 25 gallons, which I assume is too large? Can't really picture load size. If you google custom water tank, you will find a lot of companies that do this. Maybe just a big plastic water container.
http://www.huskyportable.com/bladder...anks_id46.html
Here is another:
http://www.plastic-mart.com/category...Custom%20Water
Maybe these:
http://www.plastic-mart.com/category...er-waste-tanks