What I do is collect a bunch of eggshells, boil them or nuke them to eliminate bacteria for storage, then put them in the oven for 20 minutes, then grind them in a special coffee grinder to get the pieces small. Then store them, and dispense onto the plant as needed.
If you don't have a coffee grinder, you can just put the shells in a bag and bang it about a lot, just get it as small as you can.
Some folks say that you can use calcium and eggshells to supplement your own diet, but I would not necesarily recommend it because it is, believe it or not, easy to overdose on calcium. But if you are interested because you are dairy free and known to be deficient, you basically do the above.
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