Here is the link to the ranch powder recipe I made mine using powdered milk instead of powdered buttermilk and I liked the results just fine.
Here is the link to the Italian dressing mix I love this. I love the flavor much better than bottled Italian dressing. Both of these recipes are great because you can make a big batch of the mix and then use it in small quantities as needed. Just make sure your spice cupboard is stocked before you start making the mixes as they use a lot of spices/herbs. These are well worth your money and time.
By the way I used both of these while making Cafe Rio Chicken: