1. Before hitting the road remove wallet and insert (charge) with as much cash as it will hold.
2. Upon returning "recharge" again.
3. If you find that the wallet isn't holding a "charge" there are many "recharging" stations available. Look for the ATM sign. They used to be called cash machines, I called it a Crash machine, before the proliferation of electronic payment methods people would line up to withdraw money. This always reminded me of seeing movies of people making a "run on the bank" after the 1929 stock market crash.