emphasis on stable for tent pegs. also add hint about a hammer

docs/how-to-survive.md

@@ -4,7 +4,8 @@
 
 ### Camping Equipment
 * a tent
-* stable tent pegs (best use v-profile ones)
+* **stable** tent pegs. The ground is hard.
+    * maybe a hammer or other tool to drive them into the ground
 * a sleeping bag
 * a mattress and a sleeping pad. Maybe a cushion.
 * a sleeping mask if you are sensitive to light.