They add the liquid is cleaner than local tap water.
The device was built for the United Nation's child-focused charity Unicef to promote a campaign highlighting the fact that 780 million people in the world lack access to clean water.
The machine was designed and built by engineer Andreas Hammar, known locally for his appearances on TV tech show Mekatronik.
He said the critical part of the sweat machine was a new water purification component developed by a company named HVR in collaboration with Sweden's Royal Institute of Technology.
"It uses a technique called membrane distillation," he told the BBC.
"We use a substance that's a bit like Gortex that only lets steam through but keeps bacteria, salts, clothing fibres and other substances out.
"They have something similar on the International Space Station to treat astronaut's urine - but our machine was cheaper to build.
Volunteers have been sampling the treated sweat since the start of the week in Gothenburg
"The amount of water it produces depends on how sweaty the person is - but one person's T-shirt typically produces 10ml [0.3oz], roughly a mouthful."
The kit has been put on show at theGothia Cup - the world's largest international youth football tournament.
MattiasRonge, chief executive of Stockholm-based advertising agency Deportivo - which organised the stunt - said the machine had helped raise awareness for Unicef, but in reality had its limitations.
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