This will certainly work but I DON'T recommend to you that you use it. A water tap with a electric valve. An insulated watertight form the size of a truck battery. A control system. A storage tank for a compressed gas like lpg, butane. THere others but I only have experience with these. An inert gas that wont harm the atmosphere would be better. Plumbing with electrical valve to control the flow of gas. Set up the controller so that it will flow 1" of water into the form and stop. Then opens the valve to the gas so that the flow of super cold vapor cools and freezes the 1" of water. I don't know how long it will take but I've seen it happen almost instantaneously. You would have to adjust for your flow rate and the the thermal impact of the chosen gas. The controller would then add 1" more water and gas it again. Repeat until you have your "truck battery" sized block of ice. Again, this is not a suggestion of what you should do just an explanation of how it could be done if this was a theoretical problem. You could do this with cooling coils but to freeze a block all at one time would be very hard. But use enough energy to take out the heat energy in a block of water and it'll freeze pretty fast.