I had Juvederm injected into my jowls this afternoon. OK to move my mouth, like while eating? May I drink out of a straw?

Eating should not be a problem after filler injections into the jowls. Best of luck with your results.  

There is no reason you should not eat or in every other way move normally after filler injection. The filler will not move or break down. The only limitation is that you should not actually massage the filled area on the day of the procedure.