First, heat the dis water to about 100°C. Then fill it into glass or ceramic pot (or the glass bottle, but I would suggest sth not transparent). Put the pot on a candle (like if you would keep coffee warm). This is important because the water must circulate to become filled with CS particles. Then cautiously(!) put in the silver sticks into the water with a distance of about 5-7 cm.
After 10-20 mins the water should get a yellow or brownish color.
See you and good luck !
PS: oh.. forgot to mention: be careful when removing the silver sticks from water. Sometimes some small parts of silver which are not colloidal can get into the water. That's very toxic and poisonous.