Any pro-tips to keep the kitty litter costs low?

So I got two cats

We are currently using non-clumping litter and I have been changing the litter daily since it seem like it is really needed. I bought a twenty pound bag of this on Friday and we are almost out.

My sister advises against clumping litter since it seems to get tracked around more. I think I can deal with that if it means I can just scoop out solid clumps and not entirely change both litter boxes everyday (I have a litterbox in my closet too).

The shelter was feeding them wet food so now that they have been on solid food the last few days their poo seems to be more solid so that is good. And the kitten only made one mistake the first night she was here so I am very proud of Star Mittens.

I have a hunch we have some cat people here so feel free to share your litterbox strategies. Things like depth of litter help too. And hooded or non-hooded? Charcoal filter?