When you are living in an Indian city, finding a field to play is a big deal. A real big deal. It hurts to not have your disc with you, when you have access to a lush green field, but don't have a disc to play with! Always carry it! [If you care about your clothes, carry a pair of shorts and T too!]
On a more serious note, coaches encourage new players to carry around discs to get used to the disc in the hand [This is why you see kids dribbling their basketballs everywhere, not just because it looks hip]. But don't just carry it, squeeze in a few minutes of deliberate practice, if you can, everyday -- something tiny, like switching grips quickly, without using your non-throwing hand, work on your accuracy, etc.