Neither in English, nor in Romanian. Actually there's no need to use tu :)
It's "ori" or "sau", both are viable. Or does't exist in Romanian :) and ori can also mean "times", for example, "de trei ori", which means "three times"
Bei is when you want to say "You drink water", so you say "Tu bei ape". And Beau is when you want to say "I drink water", so you say "Eu beau ape". I hope you got it now ;)