We got a conventional toilet seat and a small folding camp stool. Combine the two and use a garbage bag over the seat to catch the waste. When you have finished you can tie the bag up and keep it in an empty pet food bag that was the only thing we found that really kept any untoward smell inside. When you get to your next gas station the pet bag contents get dumped in the nearest dumpster. Uses no water at all and has worked for us.
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