hlk - re dehydration: I drink a lot of water but totally agree, it's kinda boring! I switch up my non-alc bevs. At first, it was tons of soda water with a LOT of cut lemons. Now, it is SmartWater (I like the lemon flav best) or soda water mixed with the diet lemonade we make at work.
For caffeine, I do hazelnut coffee in the am (love my Kuerig one cup!) and unsweet tea later (occasional diet coke drinker in recovery, here!). Also, re nutrition- lots of foods, like fruit, green vegs like spinach, lettuce and more, have a high water content so that will contribute to your hydration. Nutrition is SO important in recovery - when drinking, we don't retain the nutrients we actually DO consume (if we do) and in the other ways our bodies are damaged, as mentioned above, we are usually malnourished, often anemic, under-or over-weight, and such.