Can I use the same bottle in different pumping sessions in a day?

Can.. but the time the milk got to use if it's not frozen.. will be taken at the 1st pump.. like 1st pump is 10am and have to finish by 3th day 9.59 am.. 2nd pump also will be at 9.59am instead of the next timing of pump..

Can just put in containers or ziplock..put in fridge.. then use till the end of the day then go home wash and sterile it

i have a tupperware to keep everything, and keep in the fridge in between pumps

I do. I keep it in the fridge.