Poison Bottles.

Collecting all 3 of these bottles will earn you a free poison bottle for your loft.
Teleport to GiGoth. The bottle is with the trash that is behind you.

Teleport to iiC. Head to the train station. (Be sure to go the tracks that are further back and to the right).

Head to the left (when asked if you want to teleport, obviously click "no"). Jump down onto the roof of the house.

Jump down to the patio and head inside.

Walk straight back. The bottle is up the stairs.

Go back to the train station again. This time walk straight until you can't walk any further (like an invisible wall). Get as close the the side as you can and run and jump down to the ship for the last bottle.