Personally I double the amount of water. I don’t do that because of taste (I think it’s fine either way), but simply as a way to increase my fluids. The packaging makes it clear that drinking Soylent alone is not enough and that you have to continue to drink water on the side. I often forgot to do so. Therefore, by doubling the amount of water I ensure that I get those extra fluids in. Not only that, it stretches my Soylent further. Yes, I still need to drink more water on the side, but it does, for me anyway, make it easier.
I also find that I rather like the taste of Soylent. It’s not as tasty as a dessert, but it’s certainly not bad to me. 1.4 and 1.5 have been much better. Back when we had 1.1, 1.2 and 1.3 I found myself adding flavors, but I think the current/recent versions are much better as a standalone drink.