I concur with Grape here.
Unfortunately, I've had a recurring infection which turns out to be 'caused' by MRSA. I can fight it off, but it'll eventually come back.
But I've learned that sugar can and will suppress one's immune system. So... I'm stuck with water, since I need to make the milk last me awhile(cooking, cereal, etc).
If only my cereal wasn't super sugary. >.<
So... yeah. Water.