I also have a k pouch and have been in the ER for dehydration several times. I am on potassium pills (prescription). I also found something called salt sticks (Amazon) and nunn tablets (put in water bottle, many flavors)—found at bike stores, vitamin shoppe and amazon. I have also tried the liquid IV (tastes pretty good)
i always ask every doctor I see in the ER about dehydration. Several have said drinking just water actually flushes out the electrolytes. For me, by the time I feel nauseated and light headed, it is too late for drinking electrolytes to work. It sounds logical—but who knows???
i hope you find something to help your daughter.