Judy, You have several questions, so I will go through them one by one.
1. From a 1 to 10 scale (1 being the lowest), how painful would it be post-procedure?
The pain from tummy tucks vary from person to person. I would describe it more as discomfort more than pain. Your doctor should give you pain medications and muscle relaxers which will help considerably. Additionally, he or she may inject the area with local anesthesia or put in a pump to continually bathe the area with local anesthetic. In any case, as long as they are treating you correctly, you should be fine. However, it is difficult to rate 1 to 10 since the issue is subjective. I guess one would likely rate it in the 3 to 5 range.
2. Does it help to take multi-vitamins and do aerobics everyday before going through the procedure, to ensure quicker recovery?
The better shape you are in before the surgery, they better off you will be. Additionally, exercising is good for your lungs, which will help with anesthesia. As for multivitamins, that is good as well. However, check with your surgeon to make sure you are not taking anything that hastens bleeding - many homeopathic medications have such side-effects and should be avoid before surgery.
3. Will 3 months be enough recovery time?
3 months should be plenty of time. Most people return to work after two to three weeks - depending on what you do. However, by 3 months you should be back to all your normal activities. During the first 1 to two weeks post-op you will likely have a few follow-up appointments to remove drains and, possibly, sutures.
4. Are there certain things you cannot eat?
I was told to minimize my sodium intake because my body will absorb and store it, and will make me swell up much more then I normally would. Sodium (Salt) and alcohol and spicy foods may make you more swollen after surgery. As long as you keep well hydrated and have a generally healthy diet you should be fine. Just remember not to eat after midnight on the night before the surgery and don't eat breakfast the day of surgery.
5. Can you put Neosporin on the scar while its healing?
You should talk with your surgeon about what to put on your scar. Depending on what the surgeon uses to close the incision, he or she may have different recommendations. Likely, they will recommend some type of ointment or silicone product. I would suggest that you follow whatever your surgeon recommends - especially for the immediate post-operative period.
I hope this is helpful.