The drinks on the Shuttle are stored in the Capris-Sun type juice bags. They are usually dehydrated and the crew adds water. A straw with a clip is inserted into the bag. Some of the crew take vitamin pills just like they may on Earth. Some fruit is flown on the Shuttle - but we're limited mostly to the canned stuff.
Exercise amounts vary - from a few minutes to hours.
I think eventually we will be able to live on Mars, scientists are working on that right now. So exercise is very important during the missions. A lot of the astronauts are very fit folks who exercise a lot on the ground. Yes - but sometimes I 'cheat' a little. It's very exciting.