2) Avoid Too Many Drinks With Congeners
Sounds confusingly scientific but Congeners are toxic chemical by-products in alcohol that are believed to worsen hangovers
Drinks that are low in Congeners include rum, gin and vodka which contains almost no Congeners at all.
On the flip side try and avoid, whiskey, tequila, and cognac as these have the highest amounts of Congeners (with bourbon whiskey being one of the worst)