Eddie was outside walking around the city, getting totter tots and chocolate for venom. Venom was certainly hiding from eye sight but Eddie knew venom was there because venom would not shut up when it came to talking, venom was speaking to eddie telepathically

Eddie:"shut up, v" Eddie whispered, it wasn't easy talking to venom like this in public

Venom:"I'm hungry, Eddie!" Venom complained in Eddie's head