Assuming a party of PCs(Level 1) would be banished to a plane other than the Material Plane, which planes listed in the DMG would be the easy to survive on for those players?
Assuming, of course, 'survivable' means the plane(or planes) provide breathable air, food, water, and shelter(for 8 or more hours). This requirement(not Survivable requirement) also includes natural wildlife, such as [edible] creatures, [edible] plants, and monsters. These creatures, plants or monsters may or may not have hazards. The land may also have optional hazards.
The possible planes listed in the DMG are the Astral Plane('Starry Plane'), Ethereal Plane('Interlapping Plane'), Feywild('Fairy Plane'), Shadowfell('Shadow Plane'), Elemental Planes('Planes of the Elements'), Material Plane('Plane of the World'), Outer Planes('Planes of the Gods/ Demons'), the Outlands('Plane of Gates'), Sigil('Plane of Doors'), Demiplanes('Plane of Extradimensionality'), and the Far Realm('The "Unknown" Plane).