I bought the Geyser portable shower (without heater). I boil water, pour it into the unit, and add cool water to that. It plugs into a 12V socket in the van and has a replaceable integrated sponge. I use it with a shower tent outside of the van. I haven't used it, yet, but have high expectations.
I have an E350 van. It's registered as an RV because of what's on the inside - sink, fresh water, fridge, furnace, grey water tank, propane stove. But, it's a van, just a camper van.
We use a Luggable Loo (5 gallon bucket with a toilet lid) and trash compactor bags with a little kitty litter at the bottom. We use it for #'s 1 & 2, trash, and kitchen waste. After a #2 (or, when it gets full of trash), we tie it up with a zip lock and put it in the spare tire trash bag...