warm drinks in something other than a bottle?

[RockingBEYONDtheXmasTree]

DS (14m) only has his bottle for his warm milk, he has a beaker for cold drinks. I want to get him off the bottle (he's BF at night anyway, so its only really the one bottle a day with breakfast), but when I've tried putting his milk in his beaker, it leaks cause its warm. I've tried a few different beakers.

Any suggestions?

We give DS warm milk in a normal cup with a straw. He loves it!

I don't think 1 bottle a day is doing any harm.

But if you really want to get him off, we used a basic beaker from Asda with our DS1 for warm milk and it was fine. Had a lid on it. The only other option really is a cup and straw?