Boot Camp Potty is what I did. I stayed home for literally a week letting my daughter run around naked from the waist down or with just some undies one. This way if she did have an accident (which she did) she would know what it feel like and believe me did not like it. This concept I feel works the best but not for all parents especially if both work. But if you're a SAHM it's a technique I swear by. She was PT'd by 2 yr. 3 mos. old after about 10 days!! The other technique that should be incorporated w/ Boot Camp Potty is NO PULL UPS WHATSOEVER!! It clearly sends a mixed signal to toddlers and in MHO using them is doing a disservice to your child and will only lengthen the time it takes to PT your child. Besides they are way expensive, think of all the money you will save.
The other thing I did was take my daughter to the store and let her pick out her own undies. THis way there's an ownership to them and not wanting to soil them.
You also have to know when your child is ready. My daughter was staying dry through the nights for months on end, pulling off her diaper whenever she did soil it to tell me it's time to change her and using the toilet when she felt she had to go. So she was definitely ready.
I did Boot Camp Potty in March which is a horrible time to do so you are in the perfect season -- Summer!!
If out of all the things you only do one thing that I suggest it should be THE NO PULLUPS WHATSOEVER!!
Good luck!