Hi Carole,
Sounds like we’re in a similar situation. Our doctor has said more or less the same. We’re thickening fluids to stage 3 consistency and giving them with a spoon.
You might want to look up the Frazier Water Protocol. It allows the use of free water (unthickened) given either by teaspoon or in the form of small ice chips under the premise that even if it goes down the wrong way the body should still be able to absorb water. Also, ice chips are a good stimulant for the swallow as cold things can stimulate a better swallow.
Perhaps you could try that in between meals for that bit of extra fluid you’re looking for.
Good luck with everything.
Roz