dirty water

one way water gets contaminated by when people urine and dodo in toilets and it goes into our rivers instead of a waste plant.so when where drinking a bottle of water u may b drinking throw up because some times all water isn't clean.

one way that it can be dangerous to drink dirty water and u can get a disease or get very sick. also if u have a baby u are letting the baby float around in dirty water and your baby can come out sick.

in my house we have a cooler we don't drink from the foist we don't want to take any chances.

i think they don't have these inventions because maybe some of them don't care bout other people. and also they probably cant afford it .