Regular old toilet from Home Depot, with a very expensive sewerage treatment plant. I actually already have a Type II MSD (lectrosan) I was going to use on another houseboat project I never built, but it requires a marine head, and my brother won't stand for that (he remembers the old pump model we had on the old camp when we were kids. He just can't get past that.) He has to have a regular toilet, so he's got to lay out the bucks for a Type III MSD, which is only required on much larger boats by USCG regs. We'll have a nice little bathroom and shower. We're not into roughing it by any means. Where do we get all the water you may ask? We collect rain water into a large cistern (500 gallons). We collect enough water off the generator shed roof for 2 camps, maybe 12 guys, and we only collect it off one side of the roof, so only 70 square feet of roof we collect way more rain water than we could ever use. We could make 30 people comfortable with all the water we collect, as long as not too many of them were female.
Ed.