We make sodium silicate from drain cleaner and those little gel beads you find packaged with electronic items for humidity control.
The procedure is really simple, just make a solution of 10mL with 4-8grams of sodium hydroxide, use the full 8 grams if you want stoichiometric sodium silicate, and 4 grams if you want "liquid glass" solution for doing the chemical garden experiments.
Heat the solution and add in 6 grams worth of crushed silica gel beads. The finer the better. if they aren't dissolving, you might need to add more water.
Once it's dissolved, you'll have a concentrated solution of sodium silicate.
For experiments using Sodium Silicate solution, check out these videos:
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https://www.youtube.com/watch?v=xltvwhogklI