How much water depth over my jars is required?

Hi All! I bought a new canning pot (hooray!) and it said it held up to 1 quart jars...however, my 750 ml jars barellllly fit in it! How much water depth can I get away with and still be safe for canning? At this point I've got an inch, that's about it, before it starts pouring out of the pot onto my stove.

Thanks!