You must have gotten your DC from the same source as mine, on eBay, named "joeandfamily". The amber/yellow liquid is useless.
Notice that the supplier says to "put some KH in your water" revealing his total ignorance. The 4dKH water is arrived at with Reverse Osmosis water and baking soda until it reaches a "KH reading (hardness) of 4dKH".

Her is a formula for making your own:
Creating 4dkh Solution - Tropical Fish Forums
You can also make a Google search for 4dKH standard solution.

I purchased my solution on line but can't locate it right now just to be sure I have the accurate KH.