If you want to eat in Antarctica, you have to bring your food with you. All you will find there is ice.
The usual way, preferably not frozen.
They drink water.
icy cold water
You can find water there by melting ice or desalinating sea water.
You can drink water from Antarctica that has melted. The ice is melting at an alarming rate in Antarctica which is attributed to effects of global warming.
African and Arabian countries have also been asking this question. Turns out that the problem is logistical. Towing an iceberg across the Equator means that the iceberg won't survive the journey.
Water is abundant by melting glacial ice or by desalinating sea water.
People who live and work in Antarctica drink whatever liquor has been brought onto the continent by the service that hires them.
Because the humidity is so low -- five percent: Antarctica is the driest continent on earth -- best practices dictate that a human consume at least two liters of water every 24 hours.
If it is available, and if the person likes chocolate milk, it is likely that the person in Antarctica would drink chocolate milk.
If you are in the water in Antarctica, generally, you'd step onto the beach to get out of the water.
Antarctica isn't known for having any problems with water.
The Southern Ocean that surrounds Antarctica is a salt-water ocean. The ice sheet that covers 98% of Antarctica is frozen fresh water.