Hey, well done on getting through the first 2 days! They can be the hardest... especially when you don't like some of the packs!! Lol...
I don't bother with the soups as had them in the past and find I really do have much more of a sweet tooth really, so stick to the shakes. But I appreciate you probably have loads as bought a bumper pack, so here's a few tips which may help:
Firstly, I don't know how you are preparing them, but I find putting the powder in the bowl and then adding a small bit of boiling water best to start with. Use your soup spoon to blend it well, pushing it against the sides and bottom of the bowl firmly as you go, to really make it into a paste. If you measure the water out into a jug to start with, you can just keep adding it bit by bit to the bowl, doing this technique each time to properly mush it up and make it smooth. Then you can add the rest of the water, and give it a good stir to mix properly. Should sort the lumps out anyway.
You can also add herbs, spices, salt and pepper, and even a dash of tobasco if that's your 'thang'...

Certainly makes them more interesting, I think!
Other than that, just stick to the packs you CAN stomach for now, and as your tastes change (which they often do on these plans), you might find down the line that the mushroom and veg ones really are quite nice.
Good luck, and hope you find some you like!
xx