If you guys are really gung ho about a single bottle setup then take a look at General hydroponics flora nova bloom
You can run the Lucas formula with it also as covered in the article that I posted above and it cost $19 at Growers House
When using the Lucas formula using the flora nova bloom, you add 8ml of nutrients to every one gallon of water.
947 / 8 = 118 gallons of water and your only using a single bottle
So one bottle of flora nova bloom makes 118 gallons for under $20
Or
One bottle of Mantis makes 52 gallons for $99 
I tried looking for the NPK numbers on the Mantis bottle hoping to see if I could find a way to make more out of less but but couldn’t find anything on their website or looking at the bottle online …
I personally choose the two bottle setup over the one bottle because I can tweak the 1:2 ratio (8ml micro / 16ml bloom) in the two bottle setup to accommodate varying needs from veg to flower if I so choose.
If MANTIS was under $30 a bottle then I would buy one and experiment but @ $99 a bottle I won’t even buy it once.