Answer:
use a credit card
Step-by-step explanation:
Wyatt seems to travel very often, thus, it is best for him to carry a credit card in order to track his expenses. He'll be able to track his spending in different ways and he'll be able to receive hotel discounts and airline rewards due to his frequent travels.
Tracking one's credit card spending can be done online, so Wyatt can surely update himself about his spending every day if he wants to. This will give him an idea where most of his hard-earned money is going to without the need to wait for the credit card bill.