Client side is correct now,
Try this , but remember i didn't tested it.
addEvent ("tDrink", true)
addEventHandler ("tDrink", getRootElement(),
function()
setPedAnimation ( client, "dancing", "dnce_m_b")
end)
--stop animation [example button 02]
addEvent ("AnimationOff", true)
addEventHandler ("AnimationOff", getRootElement(),
function()
setPedAnimation ( client )
end)