1. Place water and three-fourths of the vegetables in the slow cooker.
2. Reserve 1 tablespoon onion soup mix. Sprinkle remaining onion soup mix over vegetables; stir gently to coat evenly.
3. Sprinkle and rub salt, pepper, thyme over the pot roast. Place pot roast on top of vegetables.
4. Place remaining vegetables around pot roast; sprinkle vegetables with remaining onion soup mix. Place lid on slow cooker.
5. Cook on low for 8 to 9 hours OR on high for 5 to 6 hours until beef is tender.
6. Carefully remove lid to allow steam to escape. Serve food directly from slow cooker.