If I have heated a full liter (or more) at a time, it's been a while. Even cooking for two, typically the most I'll heat up at a time is two cups or so.

Are you cooking for group, or perhaps you're cooking both dinner and a hot drink at the same time, or maybe you're factoring in some clean-up water, or ... ?

Just curious. But depending on your needs, you might find it works in some ways easier to just cook half a liter at a time, even if you really need a full liter in total. The nice thing about that approach is that a stove like the fancy feast is more stable with a smaller diameter pot, and you also have a smaller and lighter pot to carry. Whether I'm hiking alone or together with my wife I find that an 850 ml mug is plenty of cookpot.