Lars uses his mouth
Here's a description of the contestant's attempt. Someone's probably working on collecting some images to illustrate it.
Upon entering the room and discovering Olli standing right in front of the doors, Lars crouches down and inserts his head between Olli's ankles, turning to look up at him. When Olli opens up the tap on the water dispenser, Lars decides to use his own mouth as a vessel for catching and transporting the fluid. He also tries to catch and carry some of it in his bare hands, but then ends up throwing that fluid onto his head, for some reason. He then takes off his sweatshirt and tries to use that to catch some of the fluid. At the end of his attempt, he acknowledges that he hadn't actually been able to transfer much of the fluid. However, since two other contestants are disqualified, Lars earns third place with his 9 decilitres of fluid.
(Written by Karl Craven)