Question about sake for cooking


So I have seen people recommend using regular sake instead of cooking sake because of the additives so I bought affordable sake located near me. I am not sure how to store it once I open it though. I am guessing I should put it in the fridge once I open it. But how long can I keep it in there?

I am the only one in my household who will use it and I don’t eat a lot. I want to make sure I finish the bottle so if you have any recipe suggestions as well, I would love to hear them please. I was planning to make oyakodon and karaage. Thank you in advance!

by sugarqueen_katara