F6bTom: If you have started with your last 'purchased' ball and during the game it goes in the water, AND you have a different 'purchased' ball in your bag, you DO NOT have any choices!
Sorry to say, wrong belief: Different balls are in the inventory, not in the bag!
May I invite you to go up six posts from yours (on page 5) and read MainzMan's and my postings for some insight...