Answer:
What is seen in the water and in the sky? It is part of the rainbow and can be in your eye
Low on cash? Pick out items from this rack.
What time of day, when written in a capital letters, is the same forwards, backwards and upside down?
Passed from father to son and shared between brothers, its importance is unquestioned though it is used more by others.
Very helpful if you intend to go gently down a river.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.