Here are items I tend to keep on hand at all times.  Again, keep in mind that what works for one person might not for another.  For example, I know lots of women with insulin resistance who have gone dairy free, but I haven't needed (or wanted!) to do that.  

Smoothie Station:
-Organic Dairy Products (Whole milk, plain whole-fat yogurt, cream cheese)
-Whole Fat Greek Yogurt
-Unsweetened Almond or Coconut Milk
-Coconut Oil
-Whey Protein Powder (My favorite is Tera's Whey!)
-Hemp seeds
-Chia Seeds
-Flax Seeds (milled)
-Almond butter
-Peanut butter
-Berries or other lower GI fruit

Baking Supplies:
-Coconut Flour
-Almond Flour
-Cocoa powder (unsweetened)
-Stevia (Liquid and packets)
-Stevia in the Raw
-Xanthan Gum

Lunch Box:
-Salad greens - spinach, kale, arugula, etc.-
-Oils and Vinegars to make homemade salad dressing
-Seasonal Fruits and Veggies
-Sprouted Grain Breads (Like Food For Life Ezekiel Bread)

Snack Attack:
-Nuts (almonds, peanuts, pecans, pistachios, etc.)
-Nut butters
-Cheese Sticks
-Organic Full-Fat Cottage Cheese