How do you track burn/runway?

Tracking our burn and runway has been a challenge for us so far. We are an early-stage bootstrapped startup and a lot of our expenses get charged to 0% interest credit cards. We end up with a lot of small charges like meals and Uber rides. In the end, it gets fairly complicated to keep track of and to know exactly how long we have until we run out of money.

What is your funding situation and how do you keep track of your burn rate and runway? Is it something you feel is "solved" for you or are you still looking for better solutions