Have you all seen the watering cans made from milk jugs?  
They are quick, thrifty and easy to make.
Just rinse out your finished milk jug.  Heat up a big needle or nail with a candle or lighter and melt holes in the milk cap.  
It pours out a fine stream that won't damage tiny plants.  
And children just love refilling it and watering anything they can with it.  
I used a gallon jug but when it is full,  it is too heavy for 2 and 3 year olds.  I am going to save my current 1/2 gallon jug to make a smaller one.