When purchasing a drink in the Generation III and IVgames, there is a 1/64 chance that the player may also receive an extra drink for free. In Generation V, this chance is increased to a 1/32 chance. In Omega Ruby and Alpha Sapphire, there is also a chance of an extra drink, with an even slimmer chance of two extra drinks. When this happens, the message "Score! An extra can of <item> dropped down!", "Bonus! Another can of <item> dropped down.", "What luck! Another <item> tumbled down!", or "Score! You got a bonus drink! An extra bottle of <item> dropped down." is displayed, depending on generation. In Black 2 and White 2, there is a Medal for having this happen.
Although Vending Machines are listed as dropping a can of the drink in question regardless of what drink is purchased, the item menu sprites depict only Lemonade coming in a can.
However, all three drinks were depicted to be in cans in their Generation I artwork.
Out of the items sold in the Department Store Vending Machines, Fresh Water is the best deal from a /HP comparison, at 4/HP. Soda Pop is the worst deal, at 5/HP, and Lemonade is in the middle, at 4.375/HP.
Of the Cable Car entrance Vending Machines, Fresh Water comes in at 8/HP. Soda Pop, which is still the worst deal, at 10/HP, and Lemonade at 8.75/HP.
Of the Team Magma and Aqua Hideout office vending machines, Fresh Water comes in at 3/HP. Soda Pop, which is still the worst deal, at 4.167/HP, and Lemonade at 3.75/HP.
Out of the items sold in the Ferry Terminal Vending Machines, Soda Pop is the better deal, at 6/HP. Fresh Water is the worse deal, at 6.67/HP.
Of the motel Vending Machines, Lemonade comes in at 10/HP. Fresh Water, which is still the worst deal, at 13.33/HP, and Soda Pop at 12/HP.
Of the Game Freak office vending machine, Fresh Water comes in at 5/HP.