I highly recommend trying out chamomile tea as a replacement for coffee. It has a variety of benefits, but the main ones are that it perks you up if you steep it longer than 8 mins (and drink 2-3 cups), its antifungal, and it improves bowel movements. I am sure there are more but it single-handedly helped me get over caffeine. You might also consider green tea as a transitional drink between the coffee and chamomile…it surprisingly has a variety of benefits as well (anti-oxident, anti-inflammatory, etc). The caffeine is its only downside but its quite a bit weaker the coffee (be sure not to steep it too long or it’ll get too strong).