that you can deal with that future moment when it is the present moment. attend to what is happening now. every activity in your day can become a meditation when you make a choice to give it your attention.
my cat is stalking a chipmunk. suddenly, he went into a crouch and oriented himself to the stone wall where the chipmunks live. he started doing what looks like a walking meditation: deliberate, slow movements. the difference between his attention and the attention that you’d strike with walking meditation is that he has a particular goal in mind–capturing the chipmunk.
if walking practice is your primary activity, you would not be as goal-directed 