If one only has small 1-oz cups for Kiddush, may he make Kiddush on the actual bottle of wine, and then pour into the 1-oz cup twice (and drink 2 oz), which is certainly a melo lugmav?
If one doesn’t have a choice he may make Kiddush even if the “cup” isn’t full. Therefore your bottle will be your “cup”. Regarding the drinking, although it is preferable to drink the melo lugmav without stopping in the middle, it is also not meakev, and if this is the best you can do, you are yotza. Regarding how much is melo lugmav- it depends on how big your “one cheekful” is, a bigger person needs to drink more than a small person, but no one has to drink more than a reviis itself.
O:CH 271-13, M:B 271-52, 68.