After leaving Vazquez Park, the PCT turns West to follow parallel to Escondido Canyon Road for half a mile until turning north to the small town of Agua Dulce. Since Hiker Heaven became a paid AirBnB hostel they only accept mail for paid guests with reservations. A better option is 18 miles further north in Green Valley, which has stores and a Post Office.
Before getting here, resupply and mail can be sent to either the KOA in Acton, which is directly on the trail but charges a fee for storing and holding boxes; or the Acton US Post Office, 5.6 miles to the east, which is hitchable or walkable along Soledad Canyon Road from the KOA about 6 miles BEFORE going to Agua Dulce (there are two across the street from each other near the Acton PO), or taking an Uber or Lyft into larger towns like Santa Clarita or Palmdale.
Vons grocery store delivers to Agua Dulce (but not Acton), and they waive the delivery fee for your first order. There is no longer a grocery store in Agua Dulce, and the Sweetwater Bar & Grill closed recently as well. There are three open restaurants right on the trail through Agua Dulce. One serves breakfast. There are hiker-type items and fuel available at the hardware store. The general store is a small convenience store under new ownership.