AVshrey88 in the UK at least it is a CAA mandatory requirement that CC can swim a specified distance, usually 25 metres.
I do not know of any UK airline that offers swimming lessons as part of their training course. It may be different elsewhere.
Viett_boy check the entry requirements of the airline you are applying for. If they state swimming don't apply until you can. If you turn up on a course and you can't do this it will be identified when you are tested on the wet drills.
If you cannot do this it is likely you will be booted off the course
I would say regardless of your wish to be an FA learn to swim anyway. It could save your life one day
