In the summer months for a lighter textured foundation why not create your own tinted moisturiser by mixing a little of your regular foundation with your moisturiser before applying.
For more coverage apply foundation with a brush. For lighter coverage use a makeup sponge.
Always use a brush to apply concealer. It will be more precise, blend more easily and use less product.
To get the best match and avoid a tide-line always colour test a new foundation on your jaw line and not on the back of your hand.