My chiropractor just told me yesterday not to drink anything with meals, because it dilutes the stomach acid. But now that I think about it, pH is a logarithmic scale, so I think it would take a lot of water to make a difference.
I’ve also read in the past that if you’re drinking enough water throughout the day, you won’t need any drinks with meals. That’s been my experience — pouring a glass of something doesn’t even occur to me.
Another reason for me not to drink with meals is that it’s recommended for weight loss, to make you feel full faster. That’s the opposite of what I need.