Unless you were planning to transport a giant iceberg with a boat, it doesn't matter that there is a lot of fresh water in Antarctica.
Water is very cheap, people need it. The important thing is to have available water near the people that is easy and cheap to process. So it's important to keep the big rivers as clean as possible, and use that water efficiently.
If tomorrow all the ice in Antarctica magically disappears, it would not change the problems of the people that need water to drink or cultivate plants.
(If the ice magically disappears, it will create other problems changing the climate patterns. If it just melt instead of truly disappearing, it will cause floods.)
Antarctica exists basically in two separate ice sheets, the East Antarctic Ice Sheet and the West Antarctic Ice Sheet, the first of which consists of 90% of the sheet.
The collapse of ice in Antarctica is basically limited to the tinier West Antarctic Ice Sheet, with the EAIS expected to make a more or less neutral balance (perhaps even slightly positive).
If I actually want to use fresh water, Antarctica's ice is not available at all - at least not until we start towing icebergs to Saudi Arabia or something...
Maybe I'm missing something, but what does that do for us? It's not like you or I are drinking antarctic water. For it to get to us, it has to melt into the salty ocean, evaporate, and then rain.
