Hey Calibasco, how's the planning going? I just thought of a couple more things you should consider taking with you on your trip. I took a couple boxes of energy bars/Nutragrain bars for those afternoon pick-me-ups when you don't want to stop and eat. We really only had breakfast and dinner while biking. I'd have a bar and fruit for lunch because I knew that if we stopped for a Spanish meal we'd never make it more than 15 Km. a day, not to mention the wine! I've ridden my bike drunk before in Ireland and believe me, it's not fun (or easy) OR SAFE! Couldn't resist those pints of Guinness while watching Spain womp all over England. (in the olden days)!
Also, I'd suggest Gatorade gum- I'm sure it doesn't do anything for you but it was fun. Take some powder for drinks- Gatorade or some of those energy packs (those blue ones- can't remember what they're called). I made one water bottle with the drink and another with just water. It was a nice boost on hot afternoons. I'm not sure if I mentioned this before but bring some spices along in zip lock bags- it will give your cooking some life after 3 weeks of eating pasta!
Perhaps you could take some packets from fast food restaurants too, sugar, lemon, mayonnaise, ketchup, mustard, etc. They will come in handy! You can then trade the space with things you pick up along the way. Make sure you take some sort of detergent in a ziplock as well. More small things like shampoo in tiny bottles, hotel soaps, etc. lighten the load as you use/discard. Practice riding with a full load so you get used to the weight distribution and play around with what you're comfortable with and where you handle your weight best.
When are you going? I want to go!!!!