Alex and his droogs hang out at the Korova milk bar. Milk seems so wholesome, right?
This milk has names like "Moloko Vellocet" and "Moloko Synthemesc," which demonstrate two prominent things about this society—weird Russian-influenced slang and drugs. Alex and his friends drink milk not because of "Got Milk?" ads, but because it's laced with chemicals that get them riled up for "ultra-violence."
Bonus: the drug-milk is dispensed from the nipples of nude female statues. Alex's droogs treat these statues with respect, showing us that they treat inanimate objects better than actual women.