Bottle feeding question

Hi, this is my second baby but I never bottlefed my first.

I would like to give bub a bottle of expressed milk before bed so my husband can feed her while I put the toddler in bed.

I so far have been using the haakaa to collect from opposite breast while feeding. I have a few questions.

1. Can I put milk together from different pumping sessions?

2. How often/ when should I pump for one or two bottle feeds a day?

3. I don’t want to increase my supply by a lot, just enough to have a stash for dad to do bedtime/ morning feed.

Thank you! Any advice is welcome!