I'm not an expert, but I can tell you a few things.
1st - Your really going to need a larger tank. Half a gallon is too small. You need at least a 2 gallon tank, 5 gallon is even better!
2nd - The temperature is way too low at 69 degrees. Bettas need a heater, and the temperature should be anywhere from 76-80 degrees. >> Don't get a heater and put it in the half gallon tank! It likely will be too little water and get too hot. Heaters are rated by tank size and I'm not sure they make them for anything smaller than 5 gallons.
3rd - A filter would be a nice thing to have, but not 100% necessary.
4th - Flakes are usually not good Betta food. Try getting some kind of Betta pellets. To feed these take a plastic spoon and get a bit of tank water to soak them in a few minutes before feeding to your fish. This will soften them and make them easier to eat.
5th - Did you get any kind of de-chlorinator for the water? This is a MUST have!!!
Your Betta is probably really cold and that is why he is not swimming much. Though, if you didn't use any de-chlorinator he is probably ill from the chlorine in your tap water.
Last edited by wystearya; 03-17-2012 at 08:24 PM.