I wanted to reply to this earlier.
It's a subject very close to my heart
I'm most definitely not any kind of beer brewing expert, but I do enjoy different beers. The cheaper and healthier the better
Fred, you don't need to get into the complications of malted and roasted barley. (well unless you want to)
You can use barley and then introduce natural enzymes to do all that boring work for you.
Research.
Think about using Calamansi and Milfoil (Achillea millefolium) as a hops substitute.
Chemically it introduces a more Red Bull effect than the 'sleepy' effect of hops.
From what I think I know about you fred, you'd enjoy working on a project to develop a maltless and hop-less beer using only ingredients indigenous to the Philippines (and cheap too).
I know I'd enjoy drinking it