Try these two things: Try to change the pH of your water by putting a little bit (pinch) of baking soda in it. This worked wonders for me. Or it could have something to do with surface tension of the water so cut up some cucumbers and strawberries or some other fruit and mint and pour water over this. Let it stand for a few hours. This should work too. Try it, one of these ideas should work. The issue you are having will eventually be resolved with time, but these strategies should help in the meantime. Good luck.
Whenever I'm having trouble downing my liquids, I munch on a sugar-free popsicle or two. :) They're only a few ounces each, but I find that giving my body a little liquid makes it want more, and then drinking is easier after that. Its weird, I know.