Caffeine and flavoured drinks/pop etc can be the worse culprits for UTI's, as they irritate the urinary tract.
I would definately try and get more water into your diet if you can.
TMI question, but does it feel like you haven't fully emptied you bladder when you do go? If so I would keep an eye on it and go and get checked out by your doctor if it continues, it will be quite easy to rule out a UTI, by a sample spot test and then a culture if that doesnt show anything.