The following is the list of water service providers in 15 large cities in Africa.
And I don't know some of them.

house connection / small-piped network / standpost / household reseller / water tanker / water vendor

What or who does "household reseller" refer to?
Does "water tanker" mean a truck (or a big ship) that supplies water?
Does "water vendor" refer to an individual or an organization that sells water?

Thank you.