DIY Co2 Generator, worth it?

I just got a pack of active dry yeast (I have all other ingredients). And wanted some new insight on this.

My question though is... Is it worth it? I was planning on building one out of a 1gal and 20oz. bottle. My box is 25.5"h/22"d/20"w.

Just looking to see if it's worth the time of putting it all together.

Thanks for the replies ahead of time.

My boy grows under water plants for his fish tank and he make his own co2 gen. Its totally worth it if you do it right. I say go for it and see what happens. Try to use bag seeds if you got any