Assume that in a month, you will be sent through a time machine on a one way trip to ancient Rome. You cannot carry anything with you. What do you to prepare? How do you plan to survive and prosper?
My first thought would be to study how to make soap and shampoo. The Romans loved their baths, but never figured out soap.
Oops, toward the end of the Roman Empire, soap was introduced by the dirty unwashed german barbarians.