First off, if you don't have these ingredients at home, you can find them online or in the laundry/cleaning aisle of your grocery store. Borax is great for making laundry detergent (which will be a future post!) but I also used it to make slime. Fels-Naptha is a hard soap that's great for making dish soap, laundry detergent, etc.
While the water was boiling, I grated the soap to kill the time. You really don't need that much, just 1 Tablespoon's worth, so it should only take you a couple minutes.
When I first poured the hot water into the Borax/Fels-Naptha mixture and stirred, there were a lot of bubbles but don't be surprised if they go away hours later.
Be sure to stir every hour for the 6-8 hours you decide to let it set. I skipped an hour and because of the Borax, it had almost the same consistency as slime, so try to whisk it once an hour.
I had an empty Ajax bottle on hand and after 6 hours, I poured the mixture into the bottle and shook it up. You'll see it doesn't even full up half the bottle.
TOTAL COSTS: About $10
$4.25 for Fels-Naptha Laundry Bar Soap (but you're only going to use 1 Tablespoon's worth)
$5.46 for 20 Mule Team Borax on Amazon (realized it was cheaper in the store after I bought it online! Note this is for about 5 pounds worth and you're only using a 1 Tablespoon)
5 minutes to grate soap and boil water
5 minutes to let the water cool before adding to mixture
6 hours to sit
EASY-PEASY SCALE (1 super easy - 5 very difficult): 1 out of 5
It doesn't get much easier than this! Give it a shot and see if you can be an all-natural soap maker!