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Almond is good, regular oat seems to make it much thicker than others do but I am happy to chug a bit and then top off with water to slacken for the rest.
I have cashew and chocolate oatly to try.
I think I used rice milk before with some success.
Not sure if I've ever used cow milk in it...I have added hot chocolate powder or horlicks for added flavour (if you don't want to buy theirs)
Hot coffee works surprisingly well, if your having it for breakfast.
I have taken to using different 'milk' to jazz it up.
Oatly is used mostly, just bought the chocolate one to see how nice that is.