Any exchanger will give you official notice in this regard. I suggest you store Bitcoin in a big and famous exchanger like Bittrex and poloniex.
hopefully this happens like BCH and we get coins for free.

Recently Bittrex give's the BCH to the people who have btc balance to their account but what I would suggest more is to store on the wallet who's been secured by private keys since this is more recommended by the people and speculator since this is the most safest thing we do before the hardfork comes.