Don't just be a Buddha-on-the-cushion, although you shouldn't abandon formal meditation, where you sit for meditation - it's beneficial.
Meditate whenever you remember it.
You remember, then bring awareness to your meditation object (could be the breath and/or your body).
You are walking; bring awareness to the movement of your body/breath.
You are eating; bring awareness to you eating/breath.
You want to develop a sort of meditative mindset, in order to be liberated.
So do it as often as you can, spread throughout the day. Not just those few minutes on the cushion.