I make a drink with pure cranberry juice mixed with the So-Be Lean Cranberry-Grapefruit drink. I add Equal to taste and ice and it's delicious. I usually do a 1/3 - 2/3 or 1/4 - 3/4 ratio.
It not only helps with those infections, but I recently saw reports that cranberry juice has something in it that captures flu and cold bugs in your body and protects you against them. So far, I've managed to escape the bugs going around - knock on wood!!
My SAD son loves the drink and ends up drinking half of mine when he's over
Trader Joe's has the pure cranberry juice for a really decent price and I usually keep a few bottles around. It's terribly expensive in the health food stores.