could i offer one thing to multiple gods?

for context, i have altars for Lord Hermes, Lady Aphrodite, and Lord Apollon. Hellenism has really changed my life for the better in the short time i've been practicing it, and i'd like to make a letter to all gods about how turning to Hellenism has changed my life. could i offer one letter to every god, only the ones i have altars for, or can an item only be offered to one god/goddess?