That's one solution...
There are electric toilets that allow you to conserve flush water...check out the Raritan Elegance and the Raritan SeaEra
Raritan Toilets . Raritan has an optional 3 way flush that'll work with both...it allows you to JUST bring in flush water, or flush "dry bowl" or bring in flush water and flush simultaneously, same as single button flush. The optional "Smart Flush" panel only works with the Elegance.
Do NOT be taken in by claims that the VacuFlush can use "as little as 1 pint of flush water." That's VERY carefully worded. In fact, the amount of water it actually needs to keep it rinsed out and trouble-free is about the same as any other electric toilet. At least 90% of the problems with it are caused by using too little water. It's also VERY pricy.