A. For the situation that you described, I would try the following:

• You need to make sure the fountains are well cleaned. If previously used, consider washing thoroughly, then running a solution of 1 tablespoon Clorox® Regular-Bleach/gallon of water. This should get rid of any residual bacteria and allow you to reduce the bleach level in the future.
• On-going, I would think that 1 teaspoon Clorox® Regular-Bleach/ gallon of water should be sufficient to keep the water fresh. You might want to change it out on a biweekly or monthly schedule to insure it maintains it freshness.