Im 8 days post op and I still have this nasty taste in my mouth. no matter how many times I brush. My water tastes horrible and it makes it hard to keep up with my liquid intake. Has anyone had this problem?

I noticed my taste buds seem to have changed after my surgery. Have you tried Crystal Light? It adds flavor to water, but completely sugar free. I couldn't get my water intake without my Crystal Light. According to my NUT and Dr it's perfectly acceptable.

its ketosis from being zero carb right now. Your body is adjusting to burning fat as a fuel source and the stank breath is an unfortunate side effect. - btw, your breath stinks too LOL

it will taper off in a few weeks. drink as much as you can to flush the ketones out. I relied heavily on warm decaf tea.

Pocket Pals by Listerine. They burn my tongue but help so much.

Yes, it is likely a result of ketosis, which simply means that your diet is low in carbohydrates and will get better as your diet improves. There is a common mythology put out by diet promoters that you need to put up with this in order to burn your fat stores which is untrue - all you need is a suitable caloric deficit, which is what your WLS enforces. People have been successfully navigating their WLS adventures without such side effects for, literally, decades.

I have heard this is normal. I had this happen about a week after surgery. It wasn't constant but it would happen a few times a day at least. Everything had a rotten egg flavor to it. It started to taper off and stopped completely after a couple of weeks. Just get your water however you can. Crystal light was a big help and my NUT also approved herbal tea. There are a lot of mint herbal tea options which was also helpful. Just check with your NUT first to make sure it's okay for your plan.
Hope it goes away soon!