Target, Home Depot are hiring. Consider 2nd shift and third shift type work. It sucks but it leaves your days open for interviews during normal business hours. Gas Station/Convenience stores are always looking for people to work the graveyard shift.
Warehouse/logistics distribution centers are ALWAYS looking for 2nd shift workers. If you can read and pass a drug test you can be hired. Double points if you are actually legal to work in the United States. Usually there will be a staffing agency who does the actual hiring.
I once worked for a business interiors company. We installed cubicles and such for businesses. The work all had to happen after hours. Paid pretty good too. Since you are in Denver that may be an option.
Consider too grocery store/bakery. Access to food that is still fine but can't be sold is a great way to stretch your dollars.
As to your engineering job search. Please tell me you are not doing everything yourself. Get IT staffing recruiters working for you! You are a easy candidate. An IT worker with skills and experience who can start TODAY! Don't be picky! If you can land ANY sort of professional work, you can stabilize your life and keep looking for that Forever job.