metal bowl or similar.
anything that is bigger than the pvc itself and will force the pvc to flare. it needs to have a curve to it though.
you can use a heat gun or torch.
put the pvc pipe down onto the bowl (or whatever you are using) heat the pipe up SLOWLY. if you heat it up too much or get it too hot, it will crack, turn brown, bubble and will not hold the flare.
as you are heating it up, push it onto the bowl (don't force it, just push a little). it will start to flare out and once you have it to the flare that you want you have to hold it on the bowl until it COOLS. i usually pour ice water on it or run a water hose over it for a minute or so until it cools down completely.
1. take your time.
2. don't get it too hot.
3. hold the flare until it has cold again.