As far as I know, there are only two ways to have the Jerry Can leave your inventory again.
First Method: If you put any item into your hands slot and then take it out again, the Jerry Can should appear onto the ground in front of you.
Second Method: Simply click on the Jerry Can icon in the top-right of your inventory window, then drag it over the vicinity window to the left side of your screen and release your mouse. Doing this will have it appear on the ground in front of you, just like a normal item.
In either of these two cases if you wish to have the Jerry Can appear glitched into your inventory once more, you simply need to execute the "Steps to Reproduce" that I have mentioned above.
I mention this glitch not because it breaks the game in any way, but simply because it gives any player that knows the glitch a rather large advantage over other players. The reason for this being that a normal player would have to carry the Jerry Can in their hands. However, a player who is aware of this glitch can do everything they would normally do without issue, while still being able to carry the Jerry Can with them. If these two players were to turn hostile towards each other inside of the game, the player who knows the glitch would almost certainly win over the one who does not. This is because the player who knows the glitch can instantly pull out their weapon, while the other player would have to drop the Jerry Can onto the ground first, and then be able to pull out a weapon.