Thank you Phyllis but I am not trying to quit, that is easy for me. I bought it in the store and will not have money to buy it soon. So I wondered whether or not I was able to make it at home with my own ingredients.
Growing coffee at home is pretty much impossible as it likes high mountains and the correct climate hence Columbia, Peru, Brazil, Kenya, Tanzania etc. Unless you live in one of these places growing it is pretty much out as the altitude as well as climate are necessary for success. High mountain coffee is the best.
The suggestion to look for free samples on the internet looks like your best bet to me. Maybe you could try working for a local coffee roasting company if you have one near your home and then be able to buy some at a discount?
Try looking for coffee alternatives on Google or try this coffee-break.hubpages.com/hub/best-5-healthy-alternatives-to-coffee-cafix-vs-pero-vs-other-coffee-substitutes
The coffee can only be made with the seed of the plant that carries the name. There is no such ingredients different from that. You have to collect the seeds take the nuts out of the shells and let them dry to the sun, after that you toast all the nuts and finally grind them. That is the process to make the coffee and believe me it might be some synthetic powders that taste like coffee but if you are no chemical expert and have your own lab it will be better to take an alternative not coffee.