Warning: Copper compounds are toxic. Do not eat or drink them. Do not get ammonia on your hands.
You will need:
In this page (http://lanthanumkchemistry.over-blog.com/article-experiments-with-copper-i-chloride-76297411.html), the fourth experiment showed that microcrystalline copper(I) oxide was formed when copper(I) chloride was reacted wtih a strong alkali. There is another form of copper(I) oxide though, that is red.
Method 1: Produce a solution of Benedict's reagent by adding 100 mg of sodium carbonate, 173 mg of sodium citrate, and 17.3 mg of copper sulfate pentahydrate to 1 mL of water. Add some glucose, fructose, or sucrose. The sucrose must have previously been heated with hydrochloric acid, or it will not work. The blue solution should turn dark red. Add water to the solution to dissolve any excess sugar and filter the precipitate.
Method 2: React a solution of copper(II) chloride with sulfur dioxide (can be made from sodium metabisulfite crystals + concentrated hydrochloric acid). This will make copper(I) oxide. Source: Wikipedia. Actually, try sodium sulfite instead of sulfur dioxide.
Method 3: React copper(I) chloride with any strong alkali. Yellow copper(I) oxide will form.