So you're back from a run. You come in, gulp some water, and hopefully, hop in the shower. And then you probably do your after-shower-routine, grab some food, and are back on the move.
So try my dorky tip - you won't get hydrated by osmosis, but if you drink in a sports-top water bottle into the shower with you, and drink while showering (This especially works for me as I have long hair and the shampoo and conditioner can take a while to rise out of my hair.). So once you're done showering, you should have drank the full bottle.
And then you're ready to conquer the world, and hydrated!