Transitioning to Milk Ideas

Currently my son is breastfed and won’t take bottles. He has slowed down on breastfeeding so I do not have enough milk to pump to help with transition the milk by doing half breastmilk half milk. I have been offering milk at every meal for the last 2 weeks but he just doesn’t like it. Usually takes a sip and spits it out. I’ve tried cold and I’ve tried warming it up. He is currently dairy free due to a lactose issue so we are doing almond milk. Pediatrician said to just keep offering it since I’m still breastfeeding but would like to start weaning soon since we have a big move and travel coming up this summer. Any ideas or strategies that’s worked for you on how to transition to milk?