Place the water, bullion, worcestershire in the crockpot. Whisk together. Add Tri-tip. Sprinkle the Italian seasoning,garlic salt, black pepper, ground mustard, hot sauce, and oil onto the tri-tip. Cook on low for 8 hours. If you are home while it cooks, flip the tri-tip half way through. If not it will taste great if not flipped. After 8 hours shred meat and take out any fat that you find. This can be placed in corn tortillas, on a baked potato with BBQ sauce, on a roll or bun with BBQ sauce, or just eaten plain!