How do they drown then?
In the bath tub?
Shower?
Bucket?
If you do not have access to water to learn to swim you do not have access to water where knowing how to swim would prevent you drowning.
I think that all parents should make sure their kids are trained in drownproofing. It is the same as teaching them to look both ways before crossing a street. Basic safety.
Good luck with teaching them to look both ways, cross quickly at crosswalks and to walk facing traffic.