Ah, now, my Grandpa used to tell us it is Blue Riband (or 'Ribind') and is apparently named after the award given to the fastest trans Atlantic crossings by the ocean liners back in the day.
Or so he always told us anyway, we never thought to actually find out 😆
https://en.wikipedia.org/wiki/Blue_Riband
Alternatively:
A "Blue Riband" (an archaic or French-influenced spelling of "ribbon") is a traditional symbol of top-tier quality or ultimate achievement. The term originates from historical awards of prestige and has come to describe the highest honor in a given field, as well as famous commercial products.
I had a neighbour who did that as she didn't like the taste of the tap water.
She eventually stopped, but she must have spent an absolute fortune (she was very, very wasteful anyway).