Well you cant store morale ! though as some wit famously remarked you COULD store "more ale"

More seriously, many preps that go a bit beyond the truly essential will help a lot with morale.

Consider the basics, and then consider what is required to go beyond the minimum and thus improve morale

Sleep is vital, and whilst a sleeping bag on a concrete floor would preserve life, a proper folding or inflatable bed equipped with clean sheets and ample blankets would be far preferable and should be provided if circumstances permit.

Water is vital, and whilst suspect water that has been boiled or chemically treated should preserve life, but bottled drinking water tastes better, and a choice of fruit juice, fizzy drinks, tea, and coffee would be better still and should be provided if circumstances permit.

Food is an obvious requirement, and life may be preserved by MREs or similar, but freshly cooked hot meals are a great morale booster. Domestically try to store non perishables that are varied and enjoyable.
If pre planning for large scale disaster relief, consider what equipment and utensils are required to perhaps butcher and cook a whole cow, and hundreds of pounds of vegetables at a time.
Don't forget MREs as well, but as a last resort or for the first day or two of a disaster before arrangements for proper meals are in place.

Ones own stores should include liquor, tobacco, chocolate bars and other non perishable luxuries.

Do not forget games and pastimes, ones own stores should include books, board games, recorded music and the like.
If you are involved in emergency planning for large scale disaster relief, then consider what cheap and simple provision for leisure could be made. A few thousand second hand books are cheap, non perishable, and occupy but a small corner of a storeroom. Likewise a few dozen footballs (for a public shelter avoid games like baseball or cricket that require potentially lethal bats)

Presuming that electricity is available, then a giant TV is most useful for both entertaining and informing a large crowd. Many venues that could serve as public shelters will be equipped with such. If not, then try to borrow an LCD projector instead.

Both private homes and public shelters should be well lit and heated, so far as circumstances permit, as this is a great morale booster, as is air conditioning in hot climates.

A public shelter should if possible be heated to 22 degrees, and lit sufficiently to permit of comfortable reading even by older people.
Lighting at night should be very much less, but not completely eliminated.