How about I tell you I'm thinking of covering my tracks.
Oh? Really now? Is there a story behind it?
I'm going to drink half of the bottle of juice in the fridge then fill it back up with water.
Instead of covering your tracks you should just replace the juice. That would be a better result in the long term.
I'd rather just go with my plan. Then I can be lazy and not go out of my way to replace it.
Honesty is something you seem to like to avoid. Be aware that someone will notice the juice and question what happened. Best that you take my advice just replace it instead of trying to hide it.