Seems not so easy to get USD for USDT. Only way would be Kraken, but their trading engine is highly damaged (11/17/2017)
According to Tether's own disclaimer their USDT aren't even refundable?
There are Street Food Festivals occasionally, where excellent fast food gets served.
You will need to participate into similar events. Allows you to bundle working hours into timespans of consecutive days, making earnest wages. To avoid having to work 24/7