The way I give electrolytes is to hold the Gatoraid cap with some of the liquid under the chicken's beak. Dip his beak in it to get him started. The taste is good and chickens like it, so he should suck up all he needs. Just keep refilling the bottle cap until he has had all he wants.
Offer him more every half hour and he'll get what he needs.
Offer him more every half hour and he'll get what he needs.