OK, let's talk about this a little more seriously.

First of all, we're talking about managing OUTFLOW not inflow. In this case, I'd call a portable toilet place, and get one, ASAP. They are not that expensive. As far as water goes, if you're NOT using the toilets, there's not any reason at all to worry about dumping most of your other water right onto the ground for a while. It's jsut greywater. To be blunt, it's really only fecal matter that's the problem here, that's what's going to carry your disease.

If you don't want to/can't rent a portable toilet, then go shopping at the grocery store and grab a BUNCH of the plastic grocery bags. These fit nicely on a spackle bucket, and yes, you can rig up a toilet seat right over the bucket if you want. Squat, bag it, tie it shut, toss it out. Not fun, not pleasant, it will work.