Can I deduct coffee costs in coffee shops for networking purposes, even if I pay for my own coffee only?

I have a one-person LLC. There is no office space, part of the work is done from home office, most is done at the client's home.

As the business is in starting phase I have many networking meetings with partners and potential referral partners. Most of them are meetings in local coffee shops and each of the parties pays for its own coffee. Can I deduct my coffee costs for such meetings? What documentation do I need for it?