Add water to bottom of Instant Pot.
Trim extra fat off roast. Rub with 2 tbsp roast seasoning (or salt and pepper if you prefer).
Place roast in Instant Pot. Pour pepper juice on top of roast. Lay stick of butter on top of roast and arrange peppers around butter.
Close lid, seal, and set to 'manual' for 60 minutes.
When the timer goes off, let the pot naturally release for 10 minutes and then quick release the rest of the pressure (by turning the valve from sealing to open).
Remove roast to place and slice or shred. Spoon juices back over the roast and let soak in.