> we plan to take 4 to 5 days to do the hike.
Ahhhh... It took us ~12 days, and we were moving. The guide book time is slightly longer I think. Perhaps you have not taken the height of the passes into account? Basically, 'a pass a day keeps the doctor away'. You are knocking off 1,000 m up and 1,000 m down each day, *at least*. Trying to do 30+ miles per day would either be killing, or just not possible.
> Huts vs tent
Technically, camping is illegal in Switzerland below about 2,500 m. People do it all the time of course. However, it can be difficult to find suitable non-obvious sites. A lot of that country is either steep, farmers' fields, or above the tree line.
The huts are fun.
> carry more than 1 days worth of food?
No. many people do the walk with a day pack containing a water bottle, lunch and spare clothing.
> what are your food storage recommendations.
Question not understood, sorry. No bears.
> is it safe to park a car for that long without it being broken into?
Well, I would hide all the gear from sight, but Switzerland is fairly good.
> will the trail be snow free this time of August?
Normally, but recent years have been very variable. We went over the Col du Bonhomme twice in summer, in snow. The weather wasn't all that good either. Another time, the first day out of Chamonix had us in a howling storm over the pass, and there was snow everywhere the next morning.