I do everything via cash. I have no debt. I’ve bought bus tickets, rented a car, airline tickets, etc.
It’s doable without a credit card, just difficult. We showed up to pick up our RESERVED rental car in LA once and all we had was a debit card. They would not let us have a car. We scrambled and found one rental car company at the airport that would let us have one. I believe some companies have changed the rules in the last five or six years to accomodate that, but I don’t know.