If you're still wondering, waterless wash will scuff up your car IF it is filthy. If you care about swirls and such, I would not recommend waterless wash (it's like rubbing in dirt).
You mentioned that washing at home took around two hours. It takes me about 2 hours to fully detail a car: wash, clay, wash again, dry, polish, wax.
If you don't need the extra detailing, you can probably do it in about 45 minutes. Easiest and quickest way to do this is to have two buckets (rinse and wash) and make sure you work systematically. Make sure you wash your car in the shade or when it's not as hot, that way you wont get water marks or dried soap.
First, prep your buckets, one with soap and water, the other with just water. Then rinse your car with water first. It doesn't have to be perfect, and given the water restriction, I would do this fast. Then wash the car with two bucket method, ALWAYS start from the top, then work your way down to the bottom. After you're done rinse the car. If you're in a hurry, you can air dry it by driving. If not, you can dry the car with some high fiber content towels.
Alternatively, you could just pay someone to detail your car, and put on a ceramic layer. It apparently makes it so that you never have to wax, and it'll be easy to clean
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