Crowds at Churchill Downs for Kentucky Derby

The transcript discusses betting on aquifers at the Kentucky Derby, the speaker's living conditions if the bet doesn't succeed, and the excitement of the Derby event with a $49,000 prize. The sun shines on the Derby for the first time in seven years, highlighting the significance of the event.

What does the speaker mean by saying they are betting on aquifers?

What emotions might the crowd be experiencing as the horses approach the post?