@BearWithMe For start, try salted potato water. (They have to be without the skin, long cooked, for like an hour no problem and cut into small pieces).
If you do it correctly, it will be rich in nutrients, easily digestible and will include alpha-keto-acids - these are incredibly special, they will look for “trashy” stuff in your body and turn it into proteins, Ray recommended them for people with problematic digestion to stabilise their organisms.
As for liquids in general and cavity problems which you mentioned, first I reccomend drinking acidic drinks via a straw, secondly, wash teeth with baking soda and after every food use xynitol (but to not eat it, just leave it in your mouth for 2 minutes, than spit it all out - and only use it after sweet foods, your body will think that it is consuming sugar and xynitol is not sugar, so would raise your stress hormones).
This will not solve all your problems but will at least give you some breathing room. I am not sure if it wasnt already mentioned, but you should try progest-e, pregnanelon and T3 (microdosing). Without hormonal intervention, your body will have problem stabilising itself, this should be your priority. Combined with the basics as of avoiding PUFAs and fiber (FYI pork and chicken fat are high in PUFAs thanks to their diet), it should set you on the right path.