1 1.75-liter bottle of vodka - Tim says the bottom shelf cheap vodka is fine.
4-5 sticks of red rhubarb (not green)
1/3-1/2 cup sugar
A large jar with lid
I also made rhubarb vodka this year, and with it invented the superfantastic cocktail that has since been named the "Crowd Scene":
1 oz rhubarb vodka
1 oz St. Germain elderflower liqueur
2 tbsp fresh-squeezed meyer lemon juice
1 dash bitters
Shake with ice, strain into a tall glass, fill with sparkling water.