If the simple tea supply, find a corner of the aisle with a 2~3 square meters is enough.
If the tea supply is also added to the midday ingredients processing, to put a refrigerator, microwave oven, install a sink or something, you need about 10 square meters. The location is as close to the bathroom as possible, because you have to connect the water and electricity.
If the functional requirements are tea supply, food processing, public **** printing, etc., it is necessary to at least 15 square meters