If you get a decent heater there is no reason you can't use it later on when you get your full aquarium set up You probably can wait a week I wouldn't but bettas are pretty tough fish. Just keep it in a warm part of the house, if your bowl is too small for a heater then I'd recomend getting a bigger tank as well - for a betta it doesn't have to be huge and you can pick them up really cheap. You mention lots of water changes, not a bad thing but do you have a filter in there?TAZZ said:okay so bottom line... get a water heater heeh... but would u think i could last maybe a week on what ive got - with regular water changes... cause im kinda broke but should b gettin paid soon - and would really prefer to fork out a lil more and get the whole aquarium setup.