Right on thanks for the good word. It's a 2 gallon and I got it lifted off the tray a bit now. Will that be enough light through the whole grow and do I need special water or does tap work fine?
3 gal would be better but 2 can work.
More light is better. I don't know your budget or how much space you have or your ability to control temps.
HID would be the way to go but you can pull decent bud with a T5 setup if you have experience. Seeing as it's your first grow, if you can get an HID and keep it cool, that would be your best bet. If you're sticking with the T5, you need more bulbs or supplemental lighting.
For water, get a ph and ppm tester. If your ppm is low and your ph is good, tap water will work just fine. You'll just have to see how your nutes effect your ph.
For your first grow, autos can be downright finicky bitches. Use LOW levels of nutes. A lot are nute sensitive. Also depends on your soil. What kind are you using?