HEAT oil in large nonstick skillet over high heat. Add steak; cook until browned, stirring frequently. Add salsa, water, peppers and beans; mix well. Bring to boil. Reduce heat to medium-low; simmer 10 minutes or until steak is tender.
SPRINKLE with cheese; cook an additional 5 minutes or until cheese is melted.
SPOON steak mixture evenly onto one half of each tortilla; top with 2 Tbsp. sour cream. Fold tortillas over filling.
