I only have two snakes so I keep a steno notebook for each animal. I track their feedings, sheds, poop/urine output, tank cleanings.

But, with only two snakes this is pretty easy. Back years ago I had 13 snakes - I still did this same method - worked good for me.

When my one snake had to go the vet - the vet was amazed at the information I could provide to him by flipping thru my steno book LOL. He said he wished everyone kept such thorough records of their animals husbandry.