The Brainliest Answer!
Simply we can't get water by mixing of hydrogen & oxygen gas then it will took million of years of years to form bonds between hydrogen & oxygen gas. the simple method for preparing water take a container filled with hydrogen & oxygen gas than led a platinum wire then hydrogen & oxygen gas then the gases will we occupied the space between the platinum wire and it will be forming water. 
2 4 2
take my answer as best answer please
thank you