Mouth Watering menu

Reproduced below is what I read in the magazine of Singapore Airlines, the in flight reading material, it shocked me:

‘Claride’s, London has one of the most extensive water menus. Prices range from US$ 10 to 21 a bottle….. Sommelier Pierre Legrandois of Pierre at Mandarin Oriental blind-tasted more than 60 varieties of water before choosing nine. In Singapore, French Restaurant Jaan, in Swissotel, The Stamford is launching a water menu with 17 varieties.

Water is becoming like wine, every guest asks for a particular brand’

I never knew what a ‘mouth watering menu’ meant; now I have understood!