Lets face it with a betta in a betta tank it isnt always necessary to do massive water changes. Sometimes you may overfeed the betta or notice some betta waste lingering around the bottom of the tank. So in stead of getting out the water changer hose and bucket. Why not pull out a turkey baster. You can suck out the uneaten food or betta poop without stressing out your betta or worrying about chlorine in your water. Plus what I love about the turkey baster is that you can get them for a dollar at the dollar store.
When buying a turkey baster for you betta tank make sure that it is large enough so that you don't have to put your hand in the water and make sure you keep it clean and free of cleaner before putting it in the tank.