I know it's pretty safe (even recommended) to store food in cabinets that have silica gel packs. I'm wondering if it is safe (and a good idea) to put the sealed silica gel packets directly into the food. So if I'm storing a spice mix, can I just drop a sealed pack of silica gel in the jar along with the spice mix? I also read about non-toxic indicating silica gel beads. I'm also wondering if those could be used in this way. Is there a better way to do this? 
Food-grade silica gel packets are safe to use in the way you describe, however, I wonder if it is necessary. You might want to specify the issue you are having that leads you to believe they are necessary. Silica gel packets are used when moisture will degrade a product.  As long as you keep your spices in closed containers you should not have that concern, unless you are already experiencing clumping.  Another reason not to use them in spices is that ground spices lose their aromas and flavors rather quickly.  Storing with silica gel might encourage you to keep them around longer, rather than just keeping small amounts around or working with whole spices. 