Combine four cups of boiling water and the gelatin powder in a Nalgene bottle (use all boiling water so that you can drink it as a hot beverage). Screw on the lid and shake until the gelatin dissolves.
Drink half the Jello immediately. Save the remaining Jello for the following day. You might want to store the bottle on it’s side so it’s easier to get to in the morning. If you are camping in bear country, make sure you leave it outside somewhere away from your tent, hanging, or in a bear canister.