Guess you skipped a part 32oz bottle in the link

.
So basically if you add the following oil ingredients then you fill the rest with water so it gives you 32oz.
INGREDIENTS
1/4 cup liquid castile soap (you can alternately use any of the scented Dr. Bronnerās kind as well, such as lavender, citrus, tea tree, peppermint, eucalyptus)
1 tsp. MRH sweet orange essential oil or PT sweet orange eo (alternately you can use 1 tsp. orange oil)
1 tsp. MRH Virginia cedarwood essential oil or PT Virginia cedarwood eo filtered water to fill 32 oz. commercial spray bottle (The commercial strength spray bottles are made without BPA and are strong enough to be used with essential oil. I have tried so hard to find a glass version of this, but they are just not that common still. If you donāt want to use a commercial plastic spray bottle, you can halve this recipe and use this 16 oz. glass spray bottle instead!)