The customer says there is water at the base of the toilet after flushing, which means you get to replace the wax seal. After turning off the water and flushing the tank, this cheap, off-the-shelf siphon (see photo) easily draws the rest of the water in the tank and the bowl for deposit into your handy 5-gallon bucket. It works well with clogged kitchen sinks when opening the trap might be a problem.
Mike Schultz
Mike Schultz Plumbing
Corte Madera, Ca.