.In no order...
Sheets!!!!
Towels
Pillows
Spices like dill, cinnamon
Cotton underwear and socks
Kitchen knives and pans
Maple syrup
Good peanut butter
Interesting salad dressing flavors
Cashews and pecans
Chocolate chips
Baking powder
Sanity
Positive attitude
Resilience
Apart from the nuts I agree with all of that especially the last three on the list. My Argentine wife says bras brought in the UK are much more comfortable and she can't stand ones bought here. I've never bought socks,boxers,sleepwear here due to the poor quality and strange sizes. It's now got to the stage we rarely buy any clothing here including shoes. I miss my favourite pipe tobacco which isn't available and even if it was it would be extortionate to buy. The maple syrup is a good one to bring lots of. I looked on Mercado Libre and found someone was selling it a ridiculous price.
In some ways I have adapted over the nine years I've lived here but there are still a few things I just have to have or I'd end up going crazy. Still want the hell out of it though.