Attempting Potty training again

We are trying to potty train again today.  Jack was very against it until we told him he will get 1 M&M for pee-pee and 2 M&Ms for poo-poo in the potty.  So far so good.  He has had a lot of M&Ms for peeing but no #2.  I was getting a little over confident and put loose shorts on him to go in the backyard and he peed in them even though he had just gone.  I guess he'll be bare-bottomed a bit longer.  So we will be hanging around the house this weekend near the potty.