Twelve schools from Cumbria, Devon, Hertfordshire and Pembrokeshire took part in the pilot study, which found that children would buy milk products, pure juices and water from vending machines.
Joe Harvey, director of the Health Education Trust and author of the report, said the findings would "revolutionise drinks vending over coming years".
He added: "It will never make as much money as a Coca-Cola machine, but it will be viable."
Green Machines, which provides 180 schools across the UK with vending machines containing additive-free food and drink, said there was "a strong demand" for its machines. The company has supplied 35 machines in the past three weeks.
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