Many people in the developing world desperately need clean drinking water.

This is a suggestion that you work with charities such as WaterAid, giving a donation for every bottle sold.

Perhaps artists in the developing world could produce some designs for you?

You could also be part of a scheme where people could fill up their water bottles in restaurants with drinking water etc for a voluntary fee of 50 cents or 30p which would also go to the WaterAid charity.  - See the tap into WaterAid scheme at http://www.wateraid.org/uk/getinvolved/corporatepartnerships/tapintowateraid/

Kind regards,