Luckily for you, one of the most popular articles that I ever freelanced was one on products for frizzy hair. Google's algorithms have changed in the years since it was published (and also enough strangers stole my content that I gave up filing DCMA's for it), but for two years the article ranked very well and I received more than a few products to try out and potentially include in the article. I really know my defrizzing hair products as a result. I will tell you straight up that the more expensive products work the best. Out of all of the products I've used, Bumble & Bumble, Aveda and R+Co have some of the best products to battle frizz, but bottles can run upwards of 30$ (which is what I consider expensive). However, with price comes a decent quantity and the benefit of working on almost every hair type without buildup, grease, added weight or anything else.
So, without further ado, here is a slightly comprehensive list of all of the frizz-fighting products I have used. I suggest that you pick one or two and give them a try. Or you can totally come over to my place and I'll give you what remains in most of the bottles that I have lying around so you can try out more products in less time with less cost and hassle.
Bumble & Bumble defrizz
Yes, Bumble and Bumble is pricey for the size, but I love their products. They smell good and this little 4 oZ bottle lasted me the better part of 7 months, and I wash my hair every day (yes, I know that's terrible for my hair, but I just don't feel put together if I don't have clean hair for the day). It's an oil-type gloss that you add to damp hair, although what I love about it is that you can streak it through dry hair to calm it down. Sometimes in the morning after I've straightened my hair and have it all put together, I'll go out and it'll be misting and my hair will freak out. Later in the day I use a tissue to run this product on a comb and then I'll comb it through my hair and it'll calm down without weighting my hair down or making it feel greasy (I have a lot of hair, but the strands are more fine).
R+Co Park Avenue Blow Out Balm
I adore this stuff and it's actually what I'm currently using in conjunction with an Aveda product. This is a creme that I use on my damp hair before I blow it dry. It also works pretty well if I let my hair air dry, and when I do that my hair is wavy without the frizz. It's also pricier for one container, but I bought this back in April (I think) and I'm just now starting to run out (and remember, I use this product every day and I have a lot of hair).
R+Co Tinsel Smoothing Oil
I swear I'm not a shill for R+Co- I just really like their products. Their smoothing oil is awesome because it doesn't leave my hair feeling greasy, oily or weighted down, but it smooths my flyaways and frizz like no other. It's a small bottle for the price, but a tiny bit (like the size of a pencil eraser) every day goes a really long way. You can also use this on damp or dry hair which is really nice.
Paul Mitchell Super Skinny Serum
This is very similar to Tinsel, but it weighs down my hair a little more (I have fine hair, so if your hair is more coarse, you may want the weight) and it's also a pain because you have to go somewhere to actually buy it (the horror!).
Aveda Smooth Infusion Glossing Straightener
I used this product for a long time before my salon switched from Aveda to R+Co, but I really liked it when they had it, and I still have a bit left in the tube that I've been using since like... August of last year. It lasts a really long time because you only need to use the tiniest amount for long hair to stay frizz free.
Aquage is a popular product as well and is along the lines of Tinsel and Paul Mitchell, but I don't recommend it all that highly. I grew up using it and it tends to leave my hair feeling oilier and I just don't prefer it as much to the other products.
So those are the most expensive products, and the following are some of the less expensive products that I use when I'm a little tighter on money:
John Frieda Straight Fixation Smoothing Creme
This stuff is like 6 bucks and works pretty dang well. I used it for several years daily and it did, by far, the best job of any of the similar products that I tried. It wasn't perfect and wouldn't last as long as some of the more expensive products, but it's easy to find and my go-to if I need a quick hair fix. Only downside: it can only be used on damp hair.
Pantene Curl Perfection Anti-Frizz Curl Creme
I didn't use this all that much, but when I left my hair to air dry and it invariably got curly I would use this product and it would help a lot with frizz. My roommate had extremely curly hair and would also swear by this product.
I could go on about de-frizzing products for a long time, since frizz is the bane of my existence, but I think I've mentioned more than enough products. All of these products have worked in extremely hot, humid places, as well as damp, chilly and humid places, so I think that you'd be safe using any of these when you return. Other than that, it's kind of just a guess and check process, unfortunately.