Water will work for most. You can use water with light Karo - in a pinch. Sugar water if you don't have Karo but there is a slightly higher risk of pasting.
Unflavored Pedialyte works if you can't hit a feed store.
Yes, electrolytes benefit majorly stressed, shocky or dehydrated stock.
We use it for orphaned animals of most types. They often come in stressed, shocky, dehydrated or injured and sick.
Karo only provides energy to a struggling system.
Electrolytes help rebalance blood chemistry.
The smaller the baby critter the more important those two things are, and the more delicate the balance.
Some will do well without supplementation, just warmth, food and clean water. But that will leave weaker ones, ones with small problems that would not fare well and possibly die.
If you're trying to support those then yes, some form of electrolyte and a sugar/karo boost can help with survival rates.
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