Armpit stink i need help for it?

ok i am a female 18 years old .i bathe every day and use deoderant but no mater what in a few sec the smell is still there after i wash myself with soap once it drys i can still smell it and the deoderant doesnt help... so i been told that to drink a lot of water which i almost never do will help it not smell so bad is it tru?