I would still go to the vet. I cant imagine RI just clearing up in less than 24 hours especially if you found bubbles in his mouth. You can try and feed him but if he does have RI to the point of bubbles in his mouth, I doubt he will eat but your call as you are the only one who actually sees the snake and can make the call. Plus reptiles are pretty slow to recover from stuff like RIs so it usually takes awhile for them to completely overcome it since they have a rather slow metabolism.