The subjects of the experiment did not complain. They slept well and drank from their normal bottles as usual.
Actually, I used a drastic method to make my babies sleep (11 and 13 years ago): make a regular milk bottle, but add twice the amount of powder milk. Nobody will notice. Baby will sleep well, and so will you. There was no overweight problem in them.
If you go for the beer method, add the booze in regular milk bottles to avoid incriminating photos like this one.
Do you only use your feet to walk? Look at this little fellow: