To keep the kids entertained at the store and to teach them how to shop, make written lists or picture lists. Have them participate in making of the list, if they can read and write, have them write the shopping list, otherwise have them look for the pictures of the items to shop for and make a picture shopping list. All this takes much longer, but it gets them into the habit or making their own shopping lists when they get older. As they do get older, teach them to go through the pantry and the refrigerator, to see what needs replacing and what foods they are low on, to put on the shopping list.