A.W.
Hi, this is perfect timing for you to ask this question. I just asked almost the same thing myself about 3 weeks ago.
The women on here were very helpful.
My 3 year old only just got potty trained, day time only so far.
The things we did were a combination.
I put her in real "big-girl panties" and if she wet herself she had to stay wearing them. I also told her that her wearing them was a reminder to go in her toilet, not in her panties.
I also rewarded her with a "Disney Princess" sticker every time she went in her toilet, 2 of them if she went poopy in there.
We only had 1 poopy accident and I made her take a shower and scolded her for it, some people will tell you to give her a cold shower. I did not have the heart to do that, but that is up to you.
She was completely potty trained, day time trained, with-in 3 days, and hasn't had an accident since.
Hope that helps, good luck :)