Ok i cant answer all those questions as im not familiar with that area, but I can say open carry in ur car is 100% legal and is pre-empted by state law. As long as you are over 21 you can carry concealed or open in ur vehicle anywhere within the state of MO. (although some places have the right to say you cant have a weapon in ur car on their property, but its not illegal ). And as far as buying alcohol, that also involves state law, as long as OC is legal it is legal to buy alcohol while carrying. I have no idea on the laws regarding college campus and firearms tho. Hope this helps you out a little. Oh and yes i have purchased alcohol many times while OCing, once standing right in line in front of a Deputy Sheriff and he never even blinked .