Crock Pot Beef Fajitas

2 pounds beef round steak
2 packets fajita seasoning mix
1 onion, thickly sliced
2 green bell peppers, sliced into 1/2-inch strips
1 red bell pepper, sliced into 1/2-inch strips
1/2 cup water

1. Rinse steaks with cold water and pat dry with paper towels. Season both sides of steaks with 1 packet of fajita seasoning. Slice into strips; set aside.
2. Add vegetables to a slow cooker. Toss with remaining packet of fajita seasoning. Add steak strips on top of vegetables. Pour in water. Cover and cook on low setting for 8 to 10 hours.

Serve hot with peppers, warm tortillas, refried beans, and shredded cheese, if desired.