Where does “píti” come from?

píti (Old Czech) comes from Proto-Slavic piti, from Proto-Indo-European peh₃- — to drink.

Ancestry of “píti”, step by step

Step	Language	Word	Meaning
1	Proto-Slavic	piti	to drink
2	Proto-Indo-European	peh₃-	to drink

píti — Etymology, Origin & Word History | Etymology Explorer