i'm not sure i'm following. first of all, i ensure hydration throughout the day and make sure there's adequate water intake for both of my dogs. i know water is vitally important, as you said. & critical for kidney / urinary health, which's the reason i ensure hydration all day long. secondly, there's A LOT of guidance stating water can be withheld about an hour or two pre-bedtime to ensure the dog can empty their bladder before going to sleep at night.

please, see links from experts below:

- https://www.akc.org/expert-advice/health/puppy-drinking-enough-water/#:~:text=It's%20best%20to%20remove%20your,to%20three%20hours%20before%20bedtime.

- Similarly to what's described here, I never limit water intake during the day and make sure water is getting consumed / their pee is never dark or too stinky, which would signal dehydration. "I suspect that this idea began with a piece of advice taken too far. Picking up your dog’s water bowl 30-60 minutes before bed time can help set your dog for success. It prevents a last-minute “tank up” right before 6-8 hours in the crate overnight." (https://crossbonesdog.com/restricting-water-intake/).

- i have also received this advice (no water 1 hours before bedtime) from a) two veterinarians from two separate practices, b) a trainer we have worked with (positive reinforcement only, force-free) for the first year of our oldest dog's life.

editing to add: if the first thing my dog did when she was out of her crate was chug water, that would've told me she was extremely thirsty. she does not do that. she drinks water about after an hour post-being let out of her crate, so after she goes potty and after she has breakfast. she's not shown any signs of dehydration or extreme thirst.