This papercraft is a Salt, a chemical substance enclosed in blue bottles which allow the use of Vigors, based on the first-person shooter video game BioShock Inifinite, the paper model created by Jouzumania. Salts can be collected in a number of ways. They can be purchased at vending machines, found at specalized machines that distrubute salts, and can be found in blue jars around Columbia.
Booker can find Salts in many places, including Tears, the environment, loot containers, corpses, and Dollar Bill vending machines. Certain consumables such as coffee and soda will also replenish a small portion of the player's Salts, while drinking alcohol will deplete a small amount. Smoking cigarettes will also increase the player's Salts, though at a cost to his or her health.
Salts bottles replenish a percentage of the player's Salts bar rather than a fixed amount: a small phial restores 25% of the player's Salts, a medium one gives back 50% and a large bottle or Salts machine fully recharges the player's Salts.
There are other Vigor paper models on the site:
Bioshock Infinite – Undertow Vigor Free Papercraft
Bioshock Infinite – Murder of Crows Vigor Free Papercraft
Bioshock Infinite – Shock Jockey Vigor Free Papercraft
You can download this papercraft template here: Bioshock Infinite - Salts Vigor Free Papercraft Download