But he knows (and expects) that this is a "drop in point~" for food if he needs.

And sometimes I can almost imagine him going through his list of “food outlets” and thinking “I didn’t think much of them last night, I’ll try this place today” or “they gave me cat milk and I liked that so they are worth another visit”. And he might make similar choices about his “places of residence” (of which, the old pigsties may be in favour again, he left in that direction last night).

But I guess it’s all rather more mundane survival stuff. A “food source” might go on holiday or move. Other events (eg our arrival of Furball) may make a place less desirable. And it’s possible he just feels more comfortable moving around a bit.