Ban Life Jackets and Other Floatation devices. They only Encourage Risky Behavior.

The Only 100% effective way to prevent Drowning is TOTAL ABSTINENCE from going into the water.
If you do find yourself struggling with drowning, then no life-saving or otherwise procedure or act should be allowed to be administered. You got yourself into this mess, you have to live with the consequences.
YOU SHOULD SEE DROWNING AS A GIFT.
Also, if you were forcibly PUSHED into the water, DON'T WORRY. If it was a legitimate pushing, YOUR BODY WILL FIND A WAY TO SHUT OUT ALL THE WATER, and survive the drowning.