The coffee cup for a zero g situation

you can use a one way valve to inject liquids through the bottom of the cup so a two one way valves are needed. placing one in the bottom of the cup and one on the dispenser. this allows liquids to go into the cup but not out. the reason to place on the dispenser side is so u can regulate the liquids(multiple liquids per dispenser) and it also keeps the liquid from draining in the opposite direction. to make it so that nothing penetrates the hole on the bottom and causing a leak u place a spring loaded cover that sides over the opening when u have finished getting your drink. in an essence u can call this going green because it cuts down on the packaging/plastic(material) used.

now as for the second part the dispenser it will be just capped flasks that are filled with the correct amount of water with instant mix when instructed to, then the drink is injected into the cup through pressurizing the flask till it drains. of course the flasks will be cone shaped pointed down to make sure that all of the liquids drain. within the flask is some sort of mixing devise.

if worse come to worse they can always pull out the flasks and drink out of them with a straw.