That is pushing it for size.

It does depend on what you like to eat (say rice or pasta dishes not requiring lots of water versus water to boil pasta or making soups) and how much you like to eat - if one or both are big eaters, go up.

As well, do you boil water for drinks before?

I'd go 1.3. You don't add that much weight in the jump and it gives breathing space. In all honesty, when I cook for 2 I use a 1.8 Liter pot or a 2 Liter pot. The extra space again doesn't weigh much (often we are talking 1 to 2 ounces more) but I have so much more usable space. I do make sure I pack junk in my pot to equal the extra space taken up!

When my son was little I took .9 or a 1 Liter pot often but as time went on I realized I had to boil water twice, once for drinks, then the water for dinner. I wasted more fuel doing that than just using the bigger pot