Nothing
Bald cypress in containers need regular watering it could have been just a little under watered at the nursery. Some planted in the ground here, even large trees, have browned like that.
I think your worried about nothing. Montezuma cypress, closely related to bald cypress, just a variant of the same species according to some, doesn't lose its needles it winter, it loses them in the dry season and not at all if it never gets very cold or very dry.....
Take good care of it and it will grow fine. They are not delicate. They are survivors, cousins of sequoia, they want water and sun and to turn into big awesome trees. One of my favorite species...