Rehydrate yourself well take ORS (ex.electral powder dissolved ed in water as specified on the pack) logic is to replace whatever water and
electrolytes are being lost.Dont skip meals and continue drinking plain water too.
apart from this dont self medicate yourself with any drug,specially antibiotics and anti-motility drugs.Most diarrhoea have self limiting course
Next Steps
consult with doctor if diarrhea persists beyond 48 hours,you see blood or mucus in the stools or any new symptoms develop.