My 11 yo daughter asked me a bout a picture in a prep article. It was a condom filled with water. Quickly I answered : It is a "baloon" full of water. She was excited and said it was a lot of fun.
I started wondering why preppers talk about condoms as emergency water containers when baloons are available at cheaper prices , and you don't worry about them being lubricated or not.
Sterile, quality controlled, and packaged compactly and for protection and for long(ish) storage life. The storage life of a typical balloon is not all that long, there is no significant quality control and they are often made of inferior materials. A balloon is not a good substitute for a condom.
Having said all that, there are some better alternatives to condoms available these days.