Reggie --

If there is a leak up the side of the bottle, like on a seam, maybe some duct tape would hold it temporarily - this is not a permanent solution by any means. If the problem is the seal where the dripper part attaches to the bottle, thats tougher. You don't want to use any chemical adhesives since that might hurt your little guy.

Do you still live at home with your parents? Maybe tell them that its an emergency, and that the water bottle is needed so your guy doesn't get dehydrated. Or, you could ask for an advance on your allowance, and have them deduct money from it every week until you are caught up. Or, You could work for the money (like mowing the lawn, or doing some extra chores).

Also, would you have a friend that could lend you the money? Someone you could slowly pay back? Since a bottle is under $10, you could give them back like $2 a week until paid back?