Police aren't gonna come knocking for 1 bottle.
If they did care, all youd get it a love letter in the mail about it being intercepted by customs.
If they really really care (doubt they will) then youd get a knock on the door from the police after receiving the letter. In that case, they won't have a warrant but you'll just refuse then entry and say you didn't order anything then close the door.
(Well that's what happens when you get caught with a fair amount of drugs anyways)
Police really won't care about 1/2 bottles.