As will probably come as no surprise to anybody, certain major suppliers of JET A/JetA-1 ensure that the maximum water content allowed by the Mil. Spec/ASTM standard for the fuel is the water content.
Mind you, given the price people pay for water at the local supermarket, who is to say that somebody is being ripped off paying kero. prices for water.
The real problem comes with long delivery times, as the water comes out of solution. Beware ex-SIN fuel in YPDN or anywhere round that part of the world, as but one example.
Tootle pip!