no problems
I travel to RD and MX often , which are the bastions for the "don't drink the water" phrases. ricktoronto is right about water in RD (as he is about all things RD) , don't sing in the shower! I DO drink the tap water in MX, without problems, but I only drink bottled water in RD, but past that, i don't worry about getting sick from food, and never have. Interestingly, when i come back from a trip from either pace, my body has a problem readjusting to US food. I wonder why?
I don't eat american fast food crap ever,sticking to beef,chicken and salad, although anymore the salads are giving me problems lol!
Carry Imodium with you, and take one 12 hours before you arrive, and you should be fine.
One other thing. For every person travelling with you, take at least two extra toothbrushes, cause i can guarantee that each of you will rinse a brush in tap water without thinking.Throw that one out, and remember to use bottled H2O the next time.