Have you tried Millie's Sipping Broth? They're basically tea bags to make flavored broths. They have several flavors - Curry Spice, Spicy Tortilla, Thai Lemongrass, Tomato Basil, and Delight Pho. I haven't done it yet, but I bet you could mix some unflavored protein powder in after they've brewed. It gives you a nice savory flavor on either clear or full liquids (at least my doc allows me to use unflavored protein powder in my clear liquids - yours might not).