Merge pull request #4165 from out-of-phaze/fix/waterskin-open

Fix waterskins not being open containers

code/game/objects/items/waterskin.dm

@@ -4,9 +4,21 @@
 	icon = 'icons/obj/items/waterskin.dmi'
 	icon_state = ICON_STATE_WORLD
 	material = /decl/material/solid/organic/leather/gut
+	atom_flags = ATOM_FLAG_OPEN_CONTAINER
 	volume = 120
 	material_alteration = MAT_FLAG_ALTERATION_COLOR | MAT_FLAG_ALTERATION_NAME
 
+/obj/item/chems/waterskin/attack_self()
+	. = ..()
+	if(!.)
+		if(ATOM_IS_OPEN_CONTAINER(src))
+			to_chat(usr, SPAN_NOTICE("You cork \the [src]."))
+			atom_flags ^= ATOM_FLAG_OPEN_CONTAINER
+		else
+			to_chat(usr, SPAN_NOTICE("You remove the cork from \the [src]."))
+			atom_flags |= ATOM_FLAG_OPEN_CONTAINER
+		update_icon() // TODO: filled/empty and corked/uncorked sprites
+
 /obj/item/chems/waterskin/crafted
 	desc = "A long and rather unwieldly water-carrying vessel."
 	material = /decl/material/solid/organic/leather