can it be instead of
"multe da litroj"
It would be "multaj litroj", but to my understanding, it would be A-ok.
Multajn litrojn, technically!
Why is it not "Ni havas multe da litrojn da supon?" (Maybe that example is wrong, but what I'm wondering is why is nothing here in the accusative?)
Because words don't take the accusative when after a preposition, which in this sentence is "da"