
The second bottle is on the second floor in the first section of the building - from the first bottle (or entrance) go to the far back (south side) of the building, climb the stairs to the second level, turn left at the terminal and locked double doors (which requires said terminal) and move down the hallway until entering the next room, then turn right and the bottle should be on the floor between a cigarette machine on the left and a two-drawer filing cabinet on the right.
The first bottle lays on the floor, on the left side upon entering the building.
Three bottles can be found at Jamaica Plain, in the open ruins of the store containing two inactive police Protectrons side-by-side in pods against the back wall. Four bottles at the Red Rocket shop north of Wilson Atomatoys factory between Quincy ruins and Quincy Quarries - One outside the front of the building on the ground next to the weapons workbench, three inside the building on the top shelf in front of the cash register. Four bottles can be found scattered throughout the Boston Airport ruins - Two of them are right next to each other in the lowest room of the ruins. Anti freeze bottles can be found around the Commonwealth and are sometimes sold by junk vendors. It can also be used at a cooking station to produce mirelurk jerky. The anti freeze bottle can also be used as a component to produce berserk syringe, Yellow Belly syringe, Berry Mentats, reactor coolant (following the completion of the main quest with the Brotherhood of Steel) and indirectly, Fury at a chemistry station. The anti freeze bottle can be broken down into its individual components for use in crafting.
It can be used in crafting food, chems, syringer ammo, and reactor coolant, or it can be used as a junk item. A pre- War red plastic bottle that contains antifreeze.