Well, sufficient carbohydrate intake helps. Ask anyone who's run a keto diet; they'll tell you it's much more taxing on hydration capabilities. Also, it's not so much about "pounding" water but having a consistent intake throughout the day. Try to have a pint before bed - don't worry, you won't keep waking up throughout the night to pee as it will take your body a couple hours to process it anyway. I also like to have a glass on my nightstand in case I do wake up inevitably thirsty or for first thing in the morning. Despite a high water intake, if you're taking any strong thermogenics or even just caffeine, you should drink plenty of water with it and increase intake accordingly throughout the day. Also, this one may seem obvious but if your sodium/electrolyte levels are depleted, you'll be more prone to dehydration. That's all I know.