What formula to try??

Ft mom here. Daughter is 9 weeks old today and finally found a bottle she will take.. I'm just unable to pump more then a few ounces a day looking into giving her formula for the feedings where I can whip the boob out ( like car rides or grocery shopping) also would like to be able to work a few hours here and there so I'd need to be able to leave a few bottles with gram and gramps.. there are just so many out there idk what to use.. she's a fairly gassy baby if that makes a difference??