If you let your soda go flat you can drink it, but not with a straw. Later on you can drink it regularly.
The doctor should of given you a diet to follow. If he hasn't you can find it on line google "TIF Diet".
Mostly you stick to liquids the first two-three weeks ( broth, creamy soups, jello, juices, ensure or boost, popsicles, ice cream, very thin grits). Then slowly add mushy, soft foods. By week 12 you should be eating normally.
The main thing to remember is the chew to a liquid and take small bites.
Some people find that right after the surgery they need to stay away from iced drinks. It varies from person to person.
Since you have no outside stitches you can lay in a pool fine.
Stick around and ask away any other questions you may have.