vitamins survive in high temperature surroundings if insulated?

Very soon i will be temporarily living in a desert type region of the world. Housing will be limited and electricty unpredictable. I have a selection of vitamins a probiotics that i would like to take with me. However i worry that they would not survive long in high temperatures. My plan is too contain them inside a insulated mug, that again is inside a bigger insulated mug that again in in a insulated bag. This would be designed to keep things cool for 52 hours. During the night the temperture decreases significantly so i would assume i could balance it out. Would this keep them alive?