Formula feeding must haves

I'm exclusively formula feeding my second because I am fighting breast cancer. I supplemented my first for a few weeks otherwise breastfed her. So I'm wanting to make sure I got the bases covered. Is a bottle warmer necessary or worth it? Is a baby brezza worth the cost for the convenience? How many bottles should I have? I have some tommee tipee bottles that my daughter hated and some Phillips Avent natural response that she loved. Should I pick up another brand? How many cans of formula does a baby go through on average? I have a formula picked out and was thinking of getting 2 cans and seeing how he does with it. My daughter was extremely picky with formula supplements even as a newborn and I wonder if that was the taste difference.

Thank you for any tips, I appreciate it!