What option will generate fewer aquifers in world gen

So from what I gather is that you want to create a specific map or decrease the temperature on an already created map. I don't know the latter but I can help with the former:

1. Open up DF
2. On the main screen select Design New World With Parameters
3. Select one of the presets and press the e key
4. Scroll down till you see the following (should be the second page):

5. Change the Maximum Temperature and Minimum Volcanism values
   • good values for Temperature are ~45
   • good values for Volcanism are >50
6. Finally, to ensure a good Taiga you'll want to play with the Rainfall parameter.

If you're dead-set on making due with this embark area, I would dig for the caverns. Pretty much just pick a point, and dig straight down. (If you grabbed the newest release, this has apparently been made easier by allowing designations that span z-levels.)

If you're just digging a small stairway, and not an elaborate 'grand central vein' as I usually do, it should be relatively fast to hit the caverns. I'd suggest having two dwarves dig out two side-by-side up/down stairs. This is more efficient than a single stair because they won't fight over who is digging where/when.

Once you hit the caverns, the first thing you see is almost always an underground lake. The second thing you almost always see is underground creatures. You may want to just grab a few buckets of water quickly, then floor up your stairs to keep them from surfacing, at least until you have a militia.

Once you have a fertile farmland, you never need to water it again, and can have infinite booze. You will, however, need water for tending wounded, so it might be worth building a well near the underground cavern. The bucket can drop down from the cavern ceiling, protecting you from all but flying creatures. Don't worry if the well is a hike - water is hopefully seldom used after farms are running.