You can use either a kettlebell, barbell plate, or single dumbbell to perform goblet squats. Stand with your feet a bit wider than shoulder width apart, with your single weight on the floor between your legs. Bend you knees, grab the weight and curl it up so you are holding it right at chest level. Hold the weight there as you perform squats.
Goblet squats are a great alternative to regular squats to mix up your exercise your routines, and can easily be performed at home.