We have found the best substitute for dear old dad is a teammate or teammates. If you cannot find someone to work out with you on your highschool, rec league or travel team on a regular basis, then the ideas here are good ones.
What 17 has done is enlisted the help of a player a year or two behind him that wants a starting spot. It then becomes beneficial for both, the older guy gets his reps in and does some teaching/mentoring, and the younger guy gets his reps plus hangs with someone older and learns.
17 works out with the other catcher on the team, and both of them are great for each other. It really makes for better team chemistry when the starter and backup at any position have a good relationship. When one is playing and the other protecting the bench, they are always fetching water, towels and managing the equipment for each other.