yes, if the grid goes down and electricity is gone, and i can help, i will instruct you and help you with building things that you need

really, water storage is a huge problem

concrete is effective, but when the stash of pre-made calcium hydroxide/silicic acid mix runs out, what are you gonna do?

it's not that hard to find ways to make lime, but it takes a lot of heat and a lot of clay

and this is also another prereq for being able to do rigid clay based containers

and you have to go out and gather wax from the beehives, after all the stash in the few places anyone even keeps room temperature hard paraffin these days anymore are gone, how you gonna seal up your furnace baked clay

and then how to actually acquire the sodium/potassium silicate base you need?

i'm not absolutely certain, as i haven't investigated this area of chemistry that well, how do you even acquire silicic acid, i can think of that you may need sulfuric or hydrofluoric acid to do that, as you have to take some kind of silicate salt and remove the acid part and put it into solution with a more soluble base, eg potassium/sodium

so like

yeah, idk... there's a lot of stuff that will become VERY hard to do without transport, electricity and cheap energy

i have some ideas about how it can be done, and i can read a good inorganic chem textbook about how to do the things i don't remember how to do

but it's not gonna be fun, and i can assure you, it's on my list of things to do - acquiring a full collection of textbooks

those things are gonna be gold in the post apoc, because making them is also extremely complicated