What I did was, I put a nice warm water / essential oil solution in the wipe warmer, which kept it warm, and I cleaned it out regularly.
Then you just dip a wipe in there to get a little water and you're good to go.
The wipes were kept nearby in a stack.
I found that a lot easier to deal with. I didn't really have problems while we were out, but my DS never liked to poop when we were away from home, so maybe that's why.