To add on the topic, watch your cholesterol level (must be below 200), your uric acid and the other good stuff. If you don't know what this all means, consult your family doctor. Just be prepared for a "astronaut" physical exam basically.
Vision is 20/60 uncorrected is the maximum JCAB allows. Yes, lots of water! Try to avoid caffeine until you pass the tests.
Good Luck mate!