M.S.
I don't like pedialyte either. Two things - he's old enough to have some water. If you have a sippy cup, just give it to him - he's got to get the hang of it sometime. He might actually drink quite a bit because this will be new and fun. If you have a straw, even better - they love sucking liquid through a straw and no, he's not too young. For future.... have on hand Vitalyte it can be found at vitalyte.com, running stores, REI. It's all natural. Great electrolyte replacement drink. For now, continue to offer breastmilk but if he's not taking it and not having a wet diaper, anything is better than nothing. If pedialyte is the only thing you can get your hands on, it's better than a trip to the ER. You could also google making your own electrolyte drink, if I recall it's pretty simple. Lastly, don't give Tylenol for a fever unless it's really high (and Dr. recommends it) or if he's miserable and can't sleep. A fever is the body's way of fighting infection.
Hope he's feeling better soon!!