Following this model, you could invest your funds in Vanguard Total Stock Market Index Fund and Vanguard Total Bond Market Index Fund.

NPR: Vanguard Founder Advises Riding Out The Storm

Mr. Bogle believes that a simple portfolio including only two funds, the Vanguard Total Stock Market Index Fund and Total Bond Market Index Fund would be sufficient for many investors.

FORBES: Vanguard Founder John C. Bogle -- In Person With The Bogleheads

To show this, I created and rebalanced several portfolios using the Vanguard Total Stock Market Index Fund Admiral Shares (VTSAX) and the Vanguard Total Bond Market Index Fund Admiral Shares (VBTLX).

FORBES: Choices in Portfolio Rebalancing