1. A pair of reusable nipple pasties for those summer 'fits you just don't wanna wear an uncomfortable bra with (an extra layer is just extra heat). These have thin edges that don't appear under clothing and use a medical-grade adhesive that's gentle on skin.

Promising review: "So I decided to put these to the ultimate test for 4th of July underneath my white, semi-sheer swimsuit. I wore them out in the Florida heat in the ocean all day, and they did not budge or peel off. I thought for sure these would take skin off by the time I got home because I just couldn't believe they stayed on the entire day (humidity is real).

I was able to remove them with ease. I washed them with warm water and soap and let them dry, and the next day, they were super sticky, like they were brand new out of the package again. Buying these forever.

" — Marisa Get it from Amazon for $26.50+ (available in two sizes and five shades). BuzzFeed editor Natalie Brown swears by these pasties! Check out her Nippies review to learn more.

2. A set of electrolyte-rich Liquid I.V.

hydration packets to help you get hydrated faster (it works faster than water), especially as you brave the heat to try to have fun this summer. Psst — it's also gluten-free, soy-free, and dairy-free! BuzzFeed writer Elizabeth Lilly swears by these: "I always ALWAYS pack this stuff for trips. I recently visited Vegas for ~48 hours for an outdoor music festival.

I drank one in the morning before boarding my flight, then once I got ch.