In another pot, add unwrapped caramels and water and cook on low heat, stirring contsantly until the mixture is smooth. Pour this over your Rice Krispies mixture and spread evenly. Put back in fridge to chill.
For last layer, add chocolate chips to a small pot on low heat, stirring constantly until melted and smooth. Add peanut butter and mix until smooth. Remove from heat and add to the caramel layer. Place back in fridge to chill for at least 1 hour.