This section is from the book "Experimental Glass Blowing For Boys", by Carleton J. Lynde. Also available from Amazon: Experimental Glass Blowing for Boys.
Make a nozzle at one end of a piece of No. 2 tubing, make a bend near the nozzle, cut off the other end at such a length that it will reach to within 1/4 inch of the bottom of the bottle, smooth this end, allow it to cool wet the tube and the two - ho1e stopper, shove it through one hole of the stopper, insert an elbow in the other hole, and your squirt bottle is complete (Fig. 55).
Fill the bottle with water, and blow through the elbow. Do you get a fine long stream from the nozzle (Fig. 56)?
Fig. 55. A squirt bottle
Fig. 56. Squirt bottle in action
 
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