u can utilise in 2 ways,
1.
keep oil bottles with you after every service, once you get enough amount of oil to fill engine once, use it at that time.
2.
top up your car if oil level goes down in your car(check it with oil level stick)
if your car does not loose oil or does not burn oil(that is that oil level goes down), then you should not put extra oil in your engine.
remember over filling may cause damage to the engine.
or the best possible solution is to ask someone at your workshop.