Agree with the others.
The press pots hold approximately 32 ounces - most small mugs hold about 10 ounces.
If the four of you just want to taste the coffee, one would do it. However, if you enjoy a good cup of coffee you'll need at least 2 press pots for the four of you. I could easily drink one press pot all by myself!
IMHO, Kona and BOMA/Jiko have the only really decent coffee in all of WDW!
Best wishes -
P.S. You can get Starbucks at Tubbi's Buffeteria (in the Dolphin). I usually drink Starbucks and Caribou coffee at home. I do not like the Nestles coffee served by nearly all of the WDW restaruants & counter service places.