I am a little over three days from surgery and have the worst taste in my mouth. I thought it was from dehydration but I am not sure. I am drinking liquids and sucking on ice chips. Well- this evening I was just sitting there after going for a walk and I felt like my saliva was all foamy. Anyone experience this?

this kinda sounds like either, pbing ( eating and then the food sliding back up.. it's really slimy) or maybe reflux.. I would call your doc