I know not all of my readers live in a oven hot country like I do but it's still officially Summer right? I don't leave the house without 2 things; nailpolish (unless I clear them for a sandy scrub at the beach) or something scented, either perfume or scented lotion but what's nice in summer is the body mist. It feels less heavy than strong perfumes and you can add on throughout the day. The Body Shop has plenty to choose from and also Victorias Secret and my favourite from Decleor.
If not, an alcohol-free perfume is also an option, like Dior Sweet Sun