Repeal the 16th and 17th. Explicitly forbid taxation on income from whatever lawful source. Tax consumption at point of sale-- for all items, including food. Make the tax rate part of each years' budget. Require a budget. No budget, no government; everybody locks the doors and goes home.
Rewrite the Bill of Rights in updated language. For example: in the First, say "establishing a single approved religion" instead of "respecting an establishment of religion", and double-underline the bit about not prohibiting free exercise; in the Second, delete the militia clause and say "weapons of all kinds" instead of "arms" (we're close to having some ass say that nobody's trying to cut anybody's upper limbs off, so their "arms" are safe). Add the right of the People to accuse governments at all levels of violating them, and individual governmental agents of facilitating the violation, with harsh penalties attached .