Convince the Blackfoots to Sell Water

Convince the Blackfoots to Sell Water was going to be a quest in Van Buren, the canceled Fallout 3 by Black Isle Studios.

Background
With the snowfall from the mountainside and access to a caravan or rail line, the Blackfoots could become water sellers (possibly instead of slavers). You need to convince the leader of the Blackfoots and the leader of the Hangdogs to get people to agree to this.