Unlock the market place as quickly as you can through research. The reason being once you have access to it and are able to purchase luxury resources you'll be able to buy dust water.

Considering Broken lords rely on dust more than any of the other factions and dust water boosts your total dust gain by 50% for 10 turns it's kind of the best luxury resource for BL. There you have it, nothing huge and a lot of you may have already figured it out already but this for those that are struggling with BL. Best of luck.