I am like Pam - I have allergies and there is no way I'm going to experiment with "buy it there". Been there, done that, didn't like trying to find cortisone cream to deal with it. I always bring toiletries with me. It's tricky for a month but possible.
* First off, you need to know that we are allowed 3.4 oz (100 ml) of liquid per container.
* Second, if you need a lot of liquid you can bring a 2nd container
But here's the thing - most people don't need 3oz worth of product for their trip. I've only needed 3oz for sunscreen (hard to get 100 SPF over there), & hair gel. Everything else should go into smaller bottles or use a solid substitute.
Shampoo - try a solid shampoo before leaving home. Lush has shampoo bars that last for over a month. I'm allergic to some and fine with others
Body Lotion - I like the "bee bar" from Honey House. It lasts longer than regular hand lotion and is water resistant so it lasts longer
Conditioner - I use the Jungle bar from lush
Deodorant - I use a deodorant crystal that I got at Whole Foods. I use the travel size. A regular stick deodorant is also compliant but not as compact.
Makeup remover - these come in 2 forms - "just add water" from Olay, or in small wipe packets from Neutrogena et.al.
Detergent - I use powdered detergent for washing or you can bring individually wrapped packets
Facials - I use facial clay in powder form that I add water to for a masque
Styling powder - this is an alternative to styling gel - it's available from a lot of hair dressers. I use Evo Haze.
Eye makeup remover - soak some cotton balls in olive oil. Alternatively, bring a 1oz eye drop bottle of olive oil. It moisturizes the lashes and works better than harsh chemical products.
Google "solid alternatives to liquid" and you'll get lots of ideas. Doug Dyment also has a list of these on his onebag.com site.
Less than 3 oz
Decant these items into contact lens cases, eye drop bottles, or you can order eye drop bottles
1.5 oz to 2 oz - foundation in an eye drop bottle. I like a 3-in-1 tinted moisturizer with SPF from Aveeno.
Under eye cream and serum - fits in a contact lens case
night moisturizer - eye drop bottle or... I have a half used tube of mine. The tube is 3 oz so clearly less is compliant (and smaller in the bag)
Travelite has one of the best posts on decanting I've seen:
Toothpaste - I use toothpaste dots but others don't like that. Consider a powder like Eco-dent. Or do like Travelite and put liquid in a dropper bottle.