There are several schemes, 'split the bills' or similar is one that springs to mind. They provide online quotes, but not sure what that entails.
Also, should bills always be split equally? What if some students choose to move in in July, and the others wait till September? Likewise if some go home Xmas & Easter and others don't.
I think the first step might be trying to find out from existing tenants how much the bills on the property have been recently.
Not sure how co-operative suppliers are in putting 5 or 6 names on each, making them all liable. Perhaps try and change to a supplier that does?
And if they'd rather not have a joint bank account, one that doesn't charge too much extra for not paying by DD.