The ash cloud will block out the sun but for 12 to 24 months, yes it will kill 90 to 95% of the population. One to two year supply of food and water is needed. Masks will be needed too. Human life will live on after this just not the same.
The saving of Heirloom seeds so you can grow food after the 12 to 24 months is the key. For cooking it is very important to have a gas range and about 24 month of gas to cook.
Even if you live close by what Dr. Kaku said the big volcano will must probably erupt slowly at the beginning before the large eruption happens. If you have seen other volcanoes erupt they all start slowly.
You go to the east of the U. S. and take your supplies.
This will be very hard to live throw but guys so is a total economical collapse were maybe 90% of the population will die which is about the same.
Survival is possible, we will have to deal with ash cloud. We the adults my die in the end but maybe can give our children a chance to live throw it.