[Swordmaker]

What if comets, because of the nature of their travels, gather up this dust/ice along the way? Maybe on each circuit even, renewing its supply???

How? Their gravity is miniscule. The only way that would work would be to again accept an electric nature with a charge that would attract the water.

[ForGod'sSake]

The only way that would work would be to again accept an electric nature with a charge that would attract the water.

To this layman that certainly seems possible. I don't know enough about the density of these dust/ice clouds to know if a charge could build up as a comet passes through them. Or if they would be opposite charges. It seems likely a comet would build up a charge as it moves through any medium. It also seems likely a greater and greater charge would develop as the medium becomes denser. Like when a comet approaches the sun. But that's just a back of the napkin guess, or WAG.