Don't think you are supposed to post links for other forums... (just for further future references :) )
Pure ammonia could be added, as long as you have a back up for the fish to be in.
Personally, I've never bothered adding stuff to my tanks. Fish food was enough to create ammonia, or even a feeder fish or two for "fish in" (later rehomed). Some people here use raw shrimp and panty hose... Which is just as messy as fish food
A tank should cycle between 4-8 weeks, sometimes longer. Rushing it really does no good. There is a kick start way - if there is a healthy cycled tank
you can use their filter cartridge, swish it in the water, even place it in your filter and kick start your tank's cycle.