Looking for Nutritional Drink that is mixed with water.....

Several years ago I was a member of a gym and I purchased a drink each day at the gym that I really liked.  I drank it after I worked out.  It was in a plastic bottle, and had premeasured ingredients.  I mixed with water, added a pack of equal and shook.  I can remember it kept me going the remainder of the afternoon.  I can remember it tasted great.  Does anyone know what this might have been, or can offer something similar?  I am almost 1 yr post op and looking for new things to try.  Any help would be appreciated.

I add a Special K protein mix to each 20oz water when I head to the gym. They come in individual serving packets and  give you 5 protein and taste good. I like the strawberry/kiwi flavor. They have a pink lemonade but i found it too tart.

There are a ton of drink mixes like that. You might want to check out what's available at your local GNC or Vitamin Shoppe.