Formula

My son is now 5 months, I’ve been back to work since the beginning of the year and he comes with me. I strongly dislike pumping because I barley get 3-4 oz off my left breast. He mainly feeds off my right and for some reason I cannot pump anything out of it. I’ve made the decision to start introducing formula, because I have no stock pile for days he stays with dad. I feel terrible it makes me want to cry but i also feel relieved in a sense. Which formula do you moms recommend, and any positive advice about formula feeding would be appreciated! 😌😊