It's so funny seeing this post come back up, as I myself posted this exact same question a couple months ago.
As lzqosoz94 suggested, just dumb a heaping teaspoon right into your mouth. I wouldn't suggest swishing it around, though, because then you still have to deal with the taste. I may have misunderstood exactly what he was saying, but what I do is I dump the teaspoon in my mouth, and then I chase it, typically with water, but any flavored liquid will make it easier.
I don't even taste the BCAAs this way. They are in the mouth, the mouth fills with water, and then down the hatch. No pain, all gain.