best bottle for breast fed baby

My 1 month old baby is exclusively breastfed (haven't pumped). But recently he was diagnosised with reflux and the only way I can get him to take his medicine is to put into formula/bottle. But I'm having a hard time keeping him from sucking down air. I have the playtex drop in "breast like nipple". I love the convenience of these bottles but I just can't get the air sucking to stop. I bought tommee tippie (since they have a wider base and I thought he could latch those better) and they didn't help either. I hate that they don't make latex nipples anymore- there is nothing "real" feeling with all these silicon nipples!