Freshly squeezed lemonade, orange or grapefruit juice or other juices would probably better assist your recovery. While a cold bath is probably better for the muscles, I know that a warm one will feel better followed by some gentle stretching. Think about your positive accomplishments. Don't dwell on the negatives. If you went out too fast for conditions, remember that for the next time.
Negative splits work best, but now - it's time for rest.
Try to get to sleep a little earlier than usual and be prepared to walk a little funny tomorrow. After The day after the marathon is a good day for a very slow 15 to 20 minute walk. Keep eating healthy. Avoid the temptation to run. Studies have shown that those who rest for a full week after the marathon actually perform better than those who run that week.