it's fine. and I can have it hot or cold, and using it as an ingredient in anything else is a cinch.
Are there any coffee cups that can heat up water or milk and then you can just drink out of it after cooling a bit?
Ideally like a vacuum insulated stainless steel cup for about 0.4 to 0.5 liters. And that can measure temperature and stop at 95°C to stop milk from boiling over.