JJ & Nadia,
It's really easy to heat up the chicken essence. Just place the bottle into a cup with hot water. Stand it inside a while and it'll heat up already.
Nadia,
From what I see, Annum has only 1 size. 1 rectangular paper box which looks almost A4 size. Ensure there's a small and big tin to choose from. Maybe u can buy the small tin and try that first? Also, they have those that comes in sachet (10 i think) and the packet ready to drink type too.