I've drunk the QT stuff before , was ideal when i was working if we had a way to boil water but no fridge . I'm now in the position where it's easier to take a flask of tea and use powdered milk . I can and have taken fresh milk in a small bottle which has at times gone off in a hot van , add in the faff of decanting and washing out and it's just easier to stick to powdered milk. Don't use sugar and only drink tea , don't like the smell of coffee more than anything else.