Player/PlayerInformation.cs
using Sandbox;

public sealed class PlayerInformation : Component
{
	[Property]
	public int HealthKits { get; set; } = 0;
	public int MaxHealthKits => 4;

	public void UseHealthKit()
	{
		HealthKits--;
		HealthKits = HealthKits.Clamp( 0, MaxHealthKits );
	}
}