I have no idea why you're having it with water, but it's an indication of a pain/discomfort in your esophagus, which is interpreted by your brain as reflux. I don't know when you had your surgery, but these are the kinds of quirks that seem to disappear at the one year plus mark. Hang in there!
Happy New Year,
Nissen Fundoplication 2/09
"Whatever you fight, you strengthen, and what you resist, persists.”
“Worry pretends to be necessary but serves no useful purpose”
“Accept - then act. Whatever the present moment contains, accept it as if you had chosen it. Always work with it, not against it.”