Wearing latex gloves to prepare Scotch bonnet peppers; Stem and seed peppers, then chop or slice.
In a medium bowl, add shrimp with Scotch bonnets, bell pepper, onion, thyme, garlic, annatto oil (or neutral oil), salt, annatto powder, garlic powder, and onion powder. Stir to combine well. Cover with plastic and refrigerate at least 30 minutes and up to overnight.
Using a gloved hand, scrape aromatic vegetables and herbs off shrimp and set shrimp aside in a clean bowl. Add water to vegetable marinade, then pour mixture into a stainless-steel skillet large enough to hold shrimp in a single layer.
Bring to a simmer over medium heat, add allspice berries, then cover and cook at a simmer for 15 minutes.
Add vinegar, turn heat to medium-low, and add shrimp to the skillet in a single layer. Cover and cook for 2 minutes.
Turn off heat, uncover, and stir until shrimp are just cooked through and no longer translucent, about 2 minutes longer. Season with additional salt, if desired.