Importing food or nutritional supplements into the EU is difficult because the EU still has a very protective agricultural policy. You might have to look at competitors such as mymana.
I couldn't buy Soylent (I'm in France), so I made one myself based on what I learned in the DIY Soylent community: https://diy.soylent.com
Cold, out of the fridge.
I tend to replace those meals which would usually involve some form of fast food and the likes. When time is of the essence and I don't want to think about food.