equipment

Camping can be hard if you don’t have a good equipment.
Camping can be hard if you don’t have good equipment.

We took all the necessary equipments.
We took all the necessary equipment.

Equipment is an uncountable noun. Do not use a/an, and do not add -s: ‘They have installed some new equipment.’

To count individual items, use a piece of equipment or pieces of equipment: ‘We bought three new pieces of equipment.’