The Jerry Can can be bought from any Ammu-Nation store for 25 dollars, or alternatively if that price will break the bank, they are often lying around gas stations.

It appears in the throwable section of the weapon wheel.?Pouring the full canister will not be more effective or destructive as just pouring half or less, as the trail dissipates. Leading the trail to an open fire; shooting the trail and even backfiring vehicle exhausts set the trail alight.