Powder products can be used right from the compact / palette as they tend not to harbour bacteria.
For palettes you can use art store ones but I personally find them a pain to clean and no too sturdy - Ive had 3 crack. I got my stainless steel mixing palette from
www.camerareadycosmetics.com its sturdy, easy to clean and fits perfectly into my hand. I also got my spatula from camera ready, again stainless steel so its easily cleaned and it fits into my brush roll into one of the smaller slots.
To decant liquid products you can either pour a little onto the palette or use a spatula to scrape some out of the bottle and then wipe it onto the palette. Using palettes also makes life easier for mixing up colours so you dont have to carry around every single shade in foundation.
For lipsticks I scrape a little off the top of the tube and apply from the spatula. For cream blushes I scrape out a little and put it on the palette, I'll do the same if Im using a lipstick as a blush or if I need to mix a lipstick colour up. I also use my spatula to scrape out gel liners and to use with liquid liners - apply a little of the liquid to the spatula or palette and then use a fine liner brush to apply onto the face.
Pigments are scooped out of the jar and put onto a palette or if you want to mix them up with a mixing medium you can put them into a little porcelain dish - I use a small soy sauce dish I got from target for $1.50.
Mascaras are best used with a disposable wand, that way you arent buying new ones constantly. Pencil liners can be sharpened down to sanitise - I do this infront of the client so they know it has been done. As for pencils to be used on the water line you can get a client to bring their own - makes for easy touch-ups, or you can sharpen your pencils down to sanitise.
I also always carry with me a bottle of hand sanitizer gel and antibacterial hand wipes - especially important during flu season. I use the gel or wipes before touching the clients face and after. I also use it if I drop anything (after picking up what ever I dropped and sanitizing / tossing it).
I hope all that helps. This is pretty much what I do every day when working on clients and its what I was taught at college in the sanitation / hygene units.
Oh also, I had a peek at your website
Lovely work, those bridal pics are gorgeous.