John 2:7

‘Jesus says to them “Fill the water pots with water.” And they filled them to the brim.'

On the basis of Jesus' instruction to ‘fill the water pots with water' the servers enthusiastically fill them to the brim. They are probably curious as to what He will do and perhaps a little jocular. There may well have been a few humorous remarks such as ‘let's make sure there is plenty of water there, just in case we have to drink that'. Again, however, John intends us to get the idea of overabundance.