Lots of sachets of rehydration stuff, and some balsam bogroll.
Then comfort food, chicken soup, whatever you can bear to eat.
D&V is self-limiting, and clears after a few days - 4-5 days of spray-at-both-ends hell, usually. It's preposterously contagious so boil the whole house in bleach. Expect to take about as long again to get your strength back.