My mind is water logged

I obsess over things. I didn't used to. I am now obsessed over my "hydration" plan for 26.2 miles. When I was younger I would have headed out the door and tried to barrel through 26.2 miles. Not sure whether I would have made it or not but my ego and youth would have carried me well past my breaking point. Not so now. Now I worry about what I should drink, when I should drink it and how I am going to carry it. I want somebody to tell me exactly what to do . . .and nobody can. I went to see my "running buddy" at his running store today to get advice (and to buy one of those stupid looking belts!). He told me since I was already used to carrying a 20 ounce handheld bottle that I really didn't need to spend the extra $50 to carry it around my waste (however that one had 4 10 ounce bottles). He helped me with a plan and I think this is what I am going to do . .for now . . .I will fill up my bottle at the beginning of the race (20 oz) . .drink it all by mile 13 and then re-fill it with water at one of the aid stations at mile 13 for the remainder of the race. Throughout the race then I can get gatorade at the aid stations.  I have a 12 mile run tomorrow. As far as GELs he told me to take one 20 minutes before my run, one at 5 miles and one at 9 miles. I am going to have my shoes "miled out" at the beginning of August so I tried on the new ones I am going to buy (same model Mizuno Nirvana 7's they just changed the colors). I took my "change" bottle to the bank and have saved $91.00 worth of change since October! I have another $30 on my gift card so I am just a couple of bucks shy! Twelve mile run tomorrow morning at 6AM . .I have been drinking water all day and have downloaded The Cars, The Little River Band and all of Coldplay onto one playlist so I won't have to stop in the middle of my run.