Came through last weekend. I bought 2x750ml bottles of tequila in Miami as I wanted a particular brand and thought I might not be able to get it at the Belize airport. I was then able to buy a further 3 litre bottles of vodka in Belize so a total of 4.5litres/5 bottles. They did have the tequila I wanted at the same price as in Miami.
Breezed through the red channel, while the Nothing To Declare was choked up with a couple of college groups, and Tropic now take the bottles from you when you check-in and give them back to you as you board the plane, so no need to try and squash them into an already very full suitcase!!