You will have less bourbon than the clear RISKY? WHISKY you started with because of the absorption from the wood and filter. This is the same thing that occurs in the conventional barrel aging process so we handle it the same way. Just add enough water to the bottle to bring the level back to the original level you started with. This will be where the neck meets the body of the bottle. You should end up with a product around 90 proof.
If you want to be more precise when adjusting the proof, visit our online store where you can find a proof hydrometer. This is the same tool that many distilleries use for accurate proofing.