You need an ability to capture tasks on the go. A simple paper notebook that you carry around with you can work, but you have to remember to Drain the Inbox regularly. For me, I find it easier to skip the notebook and put it directly in my phone. Currently, I do this with Todoist which gets imported into Akiflow.
I did a video on how to make this as fast as possible on iOS Faster Quick Capture & Dictation for TickTick (iOS)