What is the easiest way of preparing glusose from water and CO2? What are the conditionns required

Dear student
There is no method by which glucose can be prepared using water and CO2.
It can be prepared from the hydrolysis of cane sugar by the reaction given below:
$$\begin{gathered} C_{12}{H}_{22}{O}_{11} + H_{2}O\to C_6{H}_{12}{O}_{6 }+ C_6{H}_{12}{O}_6 \\ \left(sugar\right) \left(glu\cos e\right) \left(fructose\right) \end{gathered}$$
However green plants produce their food {glucose}by the process of photosynthesis which involves reaction of carbon dioxide and water in the presence of sunlight and green pigment chlorophyll.
$6C{O}_2 +6H_{2}O\stackrel{hv}{\to } C_6{H}_{12}{O}_6 + 6O_2$

Regards