Something that I have not seen mentioned yet on this thread…
A great thing for parent/spouses/partners to have on-hand for an emergency are straws!
If you are trying to get apple juice into a person’s mouth when they are almost completely out of it, pouring it into their mouth is messy and dangerous. But you can use a straw.
The reflex to drink from a straw still exists long after other things leave you. If you can lean them up and get a straw into their mouth, they will probably drink from it if you encourage them.
My wife has done that with me. She knows that glucagon is only a last resort, because glucagon kind of sucks. If she can lean me up, I will gladly drink juice.