My favorite summer foundation is Revlon Colorstay. It stays on all day, and if you apply it with a damp sponge it looks really natural. I wouldn’t use a brush, otherwise you get super full coverage and it can look cakey. But with a damp sponge it’s absolutely lovely! They also have a great selection of shades for people with pink undertones, yellow undertones, neutrals, etc. I have yellow undertones and the first one (left bottle, in #150 “Buff”) is the only foundation ever (so far) that matches me perfectly. I have the one next to it for when I get darker in the summer, when I mix the two. In my opinion this is possibly the best drugstore foundation out there.