Guinea Pig hasnt had anything to drink in 2 days?

Try to feed him yourself. Hold him and make him comfortable. After he is ok. Put a drop on his nose and let him lick it off. If this doesnt work. Try feeding him like a kitten who wont feed. Put a small tip of a water bottle in his mouth and let him suck on or put it in front of him (Close) and try to get him to lick it. If this doesnt work he has decided its his time to go :(