"Chicken what?" Andy asked, taking his phone to look up what fajitas even were. "Right... grab your coat and your cane, we are going shopping!" He gestured to his guest so he would follow him. "We'll walk to the store just around the corner; I'll explain how it works and help you find the things you need. And I'll give you money to pay for it all." 

Andy glanced at Alastor as he pulled the sleeve of his jacket over his arm. He recalled how puzzled his guest had been the night before, at the fastfood restaurant; the guy at the cash register had mentioned the concept of paying for food had seem alien to him. And Alastor had admitted he hadn't bought lunch, so it was possible he hadn't practised spending money yet.
"Have you researched the concept of money already or do you need a brief explanation?" he asked.