One can make one's own decorative bottle for storing holy water. Get a nicely-shaped bottle --preferably one with a flat surface on one side -- with a gold-colored or silver-colored screw on top, such as the bottles below:
 

 
Soak the bottle in hot water with a little alcohol to totally remove all paper and sticky glue, and let it dry thoroughly. Make a stencil of the words "Holy Water" ("Aqua Benedicta" in Latin), or a stencil of an appropriate symbol, such as the fish, or a symbol of Baptism. Use a chemical etching agent to etch the glass with the words of symbols you've chosen.
 
Chemical etching agents can be found here ( will open in a new browser window) and in craft stores such as Michael's. Follow carefully the instructions that come with your etching agent!