I use Oatly instead of milk most of the time - tastes lovely and doesn't have the same effect on the internals as cowjuice
T'other 'alf uses bags of milk from Waitrose - organic milk from Wales that, due to being in bags, uses a much smaller amount of packaging than cartons.
We have a milk round here that we could get on, but it's far more expensive than what we pay for milk, so just not affordable at the moment.