Answer:
Oliver poured 
 gallons of water in each container.
 gallons of water in each container.
Explanation:
Oliver has the amount of water = 0.5 gallons.
He pours all of the water into 6 containers. 
So amount of water in each container will be = 

= 

= 

= 
 gallons of water.
 gallons of water.
Therefore, in each container amount of water poured will be 
 gallons.
 gallons.