Imal nailed it; the antidote to VX (and Sarin and many other nerve gases) is the liquid form of a nerve agent called atropine.Ideally (yeah, like there is an "ideal" to an exposure to a weapon of mass destruction) 2mg of liquid atropine is injected into your thigh every 6 minutes after exposure, or if the injection is "late to the party", injected directly into your heart.
For either, what you will probably want to possess is a NAAK (Nerve Agent Antidote Kit), but civilians will probably have a difficult time getting them.
But don't fret. Atropine in diluted solution and even topical cream form can be purchased legally for your pet (you do have a pet, right??). Without question having an atropine cream covering all of your skin would yield some level of protection (post-exposure) to VX or Sarin non-inhaled exposure (though lets not go trying this for fun, shall we).
To purchase, Click Here - or find anther such pet shop