Geri

Hints on increasing efficacy of Seltzer water for mucous:
1. Buy the cans only - in cases on sale - to maximize the "fizz"
The large bottles never held enough fizz after the first rinse no matter how quickly or tightly sealed. The price difference isn't worth saving when you choke and still cheaper than OTC Mucinex stuff.
2. Use a fresh can each time (just like the professional wallpapers do who use a new razor blade each and every time they cut): no need to swallow - actually easier not- just swish and spit.
3. Keep "gargling" every time, several time to dislodge stubborn mucous at back of throat.

The above worked well enough for me to never need OTC or Mucinex although it was very bad.
Bonus: As they say on TV: But wait there's more
When I found it difficult to drink my EnsurePlus later due to mucous forming immediately after each sip, I would rinse with selzter water twice, spit and then good to go with next sip of Ensure. One can each ensure.
You are such a good caretaker. Sorry I have no experience to share with mucinex etc.