LO decided last week that we were potty training. So far he is doing great. He puts himself on the potty to pee almost every single time and to poop about half the time, but we can tell when he has to poop so we normally get him there. Only problem is that he just uses the potty but doesn't tell us he has to go so I'm afraid of taking him anywhere for too long. So far we've gone for a walk and stop at the playground (about a half hour total) and a few shorter car rides with no accidents. At what point can we actually leave the house to go shopping or something? Will I know when he is ready or is it just trial and error and bringing several changes of clothes?