Combine the 1 cup of water with the dry packet of seasoning in a large plastic sealable bag. Shake to combine. Add steak and marinade the sealed bag for at least 1 hour and up to 12 hours.
Bring steak to room temperature before grilling over high heat for 3-4 minutes per side.
While steak marinates, add 2 remaining cups of water to a small stockpot. Bring to a boil, add quinoa brown rice mix. Reduce to low. Cover with lid. Simmer for 20 minutes.
Remove from heat and wait five minutes. Fluff with fork.
Slice Steak. Add steak slices to two bowls filled with the rice mix. Top with avocado, lime, and cilantro.