When we thought all was empty, I tried to fix it myself but water started spraying so I'm going to take in to the pros. In the meantime we bought a 2 dollar bucket and kept it filled with water by the commode and poured it down the bowl after opening the valve with the foot pedal. At night we caught our shower water in the bucket and reused that water to "flush" the commode. That worked for us for 15 nights.
PS, keep some all purpose cleaner in the bathroom as you will have to clean the bowl more often.
Ken & Val [Lexi's mom] Moczygemba & Tori the dog
2017 Coachmen Concord 300 DS [Lexi III]