I'm trying to create a storage system but I don't know how many blocks and items total are possible to get. If someone could give me a number or a link where I can find how many there are, i'd appreciate it.
I guess it depends on whether you are going to store EVERY item into seperate storage - or going to group similar items into one (e.g. Stone/Stone Staires/Slabs/Cobblestone etc, maybe you are planning to store all levels of Enchantment books into 1 chest or storing them seperately)
Using 1.13.2 & a JEI-type mod to show ALL items I worked out there are a total of 1013 possible items/blocks you can get
[4 pages x 12 items across by 18 lines down]+[1 page x 12 items across & 12 lines down]+[an odd 5 further items] =
864 + 144 + 5 = 1013
However this mod also shows the blocks that can't be got through survival (eg spawners/Bedrock/Command blocks etc) so by removing those blocks I would guess Hexalobular may be close to the mark with the 967 possible items