What most naturally follows?

How to deal with a hangover the day after
Re-hydrate your body.
Whether this can truly shorten or lessen a hangover or not, it is a fact that alcohol consumption does contribute to fluid loss and that re-hydrating is essential to getting your body back into balance.
Drink lots of water the day after a night of drinking.
Try carrying a refillable bottle around with you. It's a good habit to get into even when you're not hungover.