While vodka is traditionally pure alcohol mixed with water and thus being quite tasteless, traditional gin is the distilled alcohol but infused with many botanicals to obtain that unique gin flavour.
Since gin is flavoured vodka, you could use a good quality vodka that can be infused with juniper berries, cinnamon and other herbs. There are many recipes and methods online. Some even have a ready-made gin making kit as well. Just ensure you don’t make it in the bathtub!