Since toilet training requires your child to learn new patterns of behavior, it's best if he doesn't have to adapt his learning to a variety of settings, irregular hours, or a number of different caregivers. From a purely physical standpoint, children do better with potty training if they are on a fairly regular bedtime and mealtime schedule. A schedule also makes it easier to tell when your child may be ready to use the potty. When you begin toilet training again, make sure you've chosen a potty your child is comfortable with. If he's using a potty seat with your regular toilet, make sure he has a step stool so he can get on and off it easily.
Toddlers hate to feel insecure or precarious.
He can also use the stool to stabilize himself with his feet when he has a bowel movement. Don't expect your child to immediately make the connection between sitting on the potty and actually using it. First, have him just sit on the potty for a few minutes at regular intervals, fully clothed. If your toddler is willing to do this for a week straight, he may be ready to take the next step and try it bare-bottomed. If he pees while he's sitting there, he'll make the connection himself, and after a while he'll figure out how it feels when he needs to go.