Tomke, Here's some related info that may help with your goals. The Omick Barrel toilet design, which was tested and certified in Arizona, has a comment in the "Notes on use" section of the
Urine Diversion System page that suggests that their urine diverter is so effective that some urine or water may need to be intentionally added. In other words, if your travel usage is brief, it might not make a big difference, but keep in mind that as indicated in their
Owner's Manual they are manually aerating it with a hand crank for at least 4 months above 50F, with some thoughts on adaptation to colder climates given on their
Appropriate Climates webpage.
Geoff Lawton also shows a design of a
Wheelie Bin Compost Toilet where urine is not diverted but drains out the bottom, and he says his compost is good to put around trees within 6-10 months. In his related
Overview of Compost Toilets he suggests that water to clean yourself could be used with it as well, and that the application of it with a 12V solar fan provides some degree of aeration (although I'm not sure I understand how it aerates the bins). Combining these two ideas, the principle appears to be that if drainage is provided, with some mechanism for aeration, and the retention includes an period of several warmer months, you're probably ok.
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