A blending system includes one or more tank platforms. The tank platforms are transportable via road, rail, or vessel. One or more bulk containers are located on the tank platforms. The bulk containers are capable of storing and handling concentrated fluids. A blending platform may be coupled to the tank platforms. The blending platform is transportable via road, rail, or vessel. A blending unit is located on the blending platform. The blending unit blends the concentrated fluids with one or more of the additive fluids and water to continuously produce desired fluids as needed. The desired fluids may be used in a well in a subsurface of the earth. The flow of concentrated fluids and water may be automatically controlled to provide the desired fluid with one or more properties that vary over time with a selected variation profile.