Darkvision ElixirItem 2+
AlchemicalConsumableElixir
Source Core Rulebook pg. 547 2.0
Usage held in 1 hand; Bulk L
Activate 
Interact
After you drink this elixir, your sight becomes sharper in darkness. You gain darkvision for the listed duration.

Darkvision Elixir (Lesser)
Item 2Source Core Rulebook pg. 547 2.0Price 6 gp
The duration is 10 minutes.
Darkvision Elixir (Moderate)Item 4
Source Core Rulebook pg. 547 2.0Price 11 gp
The duration is 1 hour.
Darkvision Elixir (Greater)Item 8
Source Core Rulebook pg. 547 2.0Price 90 gp
The duration is 24 hours.