Really weird
My thought - you said it happened when you had been drinking water... Is it possible your dinner was still in your pouch, and you maybe took a bigger swallow of water than normal? I know I've done that, ESPECIALLY with chicken - it seems to sit in my pouch 4-EVA (that was for you, Rose), and if I then drink too soon or too fast or too much?
And once I clear the plumbing, all is well!
Just a thought...?
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Imperfect does not = unsuccessful