Water is the single most limiting factor to travel on Grand Canyon's trails -- you must reach a water source each day or carry all the water you will need until you reach that source.
(all the water; will need; T:until you reach that source) (you; reach; that source) (the single most limiting factor; to travel; on Grand Canyon's trails) (you; must reach; a water source; T:each day) Context(you must reach,List([79, 93))):(Water; is; the single most limiting factor to travel on Grand Canyon's trails) (you; carry; all the water you will need)
you must reach,List([79, 93))
all the water you the single most limiting factor you Water you
will need reach to travel must reach is carry
T:until you reach that source
that source
on Grand Canyon's trails
a water source T:each day
the single most limiting factor to travel on Grand Canyon's trails
all the water you will need