Originally Posted by UniChris

Indeed - before I figured that out I had a couple of incidents of post-ride vomiting from drinking only water, now I know to be careful of that but cramping does still happen if I get lazy about spiking my water with electrolyte tabs. OP's reported water consumption seems a little low for that but I guess everyone is different.

I also typically have at least one foil packet of oral rehydration salts in my first aid kit - formulation may not be ideal but seems an improvement over water in a post-bonk or long train ride back situations where I've come to realize pure water is effectively all but toxic.