How do I offer things without getting ants?

So, I am new to Hellenism as a whole and I want to reach out to Apollon. I'm not really sure how though and I have kind of a lot of questions. So I cannot have my parents find out I practice Hellenism as they are Christian and I'm afraid of how they would react. 1. Do I need a different altar for each god/goddess? -I was trying to do some research and I heard that I should give an offering to hesita (I think that's how you spell it??) At the beginning and end of the ritual/prayer 2. How do I leave offerings without getting ants? -I already have a lot of ants at my house and I really don't want mode but I'm afraid that leaving food out is going to make it worse 3. Can I pray silently? -like I said, it is not super safe for me to be openly practicing but I would still like to honor the gods so I was wondering if I could pray silently or if that is seen as disrespectful