Good Morning,
This subject is one that attracts a lot of attention, usually at moments of levity but in your current planning scenario, it is obviously a great concern. As others have said, it is a space hog. You mentioned putting it in Vacuum space bags and that will allow a lot less space to be taken up. Good idea.
Of course there may be the consideration of the desecration of clean water for this particular task. Generations from now will curse us for soiling clean water. We generate plenty of gray water that can become black water with much less moral concern.
In some of the underdeveloped countries, folks use sponges. They are re-usable, can be cleaned easily and require some care with hygiene after use. Hopefully one's diet will be such that the "last act" will require very little use of TP as such. More fibre in the diet increases the "bulk" and will make the chore somewhat less daunting. I was once told by a lady physician that her father instructed her on the specifics of TP consumption as follows,"6 sheets per visit". I found that to be interesting. Of course, there are those whose aversion to the specific substance being removed who use more than 6 per application. A fact that may alter your planning a bit. Good education however, will assist you in the careful planning for this ever so important commodity.
At times of more demanding hygiene care, a sponge seems to be the easiest and requires very little storage space. Americans in general are very fond of the "paper" approach but it can be difficult to manage since consumption rates tend to vary with a number of specifics, gender, age, infirmity, etc. In my estimation, a bit of soap and water first will eliminate the need for massive amounts of paper.
In some countries, water is used with the aid of the left hand and no paper whatsoever. In places where no piped in water is available, a pitcher strategically placed is used with the right hand pouring the water and the left hand performing the task. This is "the way it is" in countries I have visited such as UAE, and other Arabic nations.
Each of us has a preference so I thought I would at least offer some alternatives to the subject if storage space and conditions are at a premium. Storing food or other survival necessities in the same location otherwise dedicated for TP storage may seem more prudent.
YMMV
Saepe Expertus, Semper Fidelis, Fratres Aeterni
Trim sends
//BT//
With all the prepping I just dont want to forget about ...well you know...that important kind of prep. How have you all calculated how much for a year for one person. Also, how do you store it. I was thinking about putting rolls in the luggage size space bags (vaccumed sealed) then for double protection in the same size ziplock bags. Any thoughts or tips would be greatly appreciated.
Thanks everyone. I really appreciate your thoughts. 
I've been a backwoods camper/hiker for more than half my life and I know how to deal with my "issues" where there is no bathroom.
