i want to perform the dedication ritual but i live with some hardcore xians who will give me some serious problems if they ever found out i was satanist and i also need alot of supplies like the burning bowl and candle. any advice?

where can i get the items needed for a standard ritual? it can't be online because i share a computer with an xian that does not know i am a satanist and would give me some serious problems if they found out.