Done a bit of googling
If you think barter will be inadequate as a system, there is an option of 'Local Currency'
It already operates in some countries
USATODAY.com - Feds lower boom on alternative money
Alternative views and uses of money - Metropolitics
..and books are available to tell you how to operate it -
Money: Understanding and Creating Alternatives to Legal Tender: Amazon.co.uk: Thomas H. Greco: Books