Sealand's "porta potty" works very well and is high quality. I had one
on my boat for awhile when I bought it until I could get the sanitation
system up to snuff. You can even hook it up to a deck pumpout later if
you desire, but it's not necessary. I'd remove the one you have now and
sell it, and apply the funds to getting one of those.

As far as the bucket solution... if you go that way, be sure it's
secured so it doesn't tip over! Yuk.