The recipe, as best I can approximate it, for the first batch of sangria made by me:

5L bottle of red wine of your choice – I used cheapo Burgundy
1 C brandy (approx) – I used Christian Brothers
2 C orange juice (approx)
half a bottle soda water
4 oranges, cut into wheels
2 limes, cut into wheels
1 1/2 lemons, cut into wheels
1/2 lb each red and green grapes
1 large can sliced peaches
1 can sliced pears
whatever other fruit you have lying around

Place all the fruit except oranges, lemons, and limes in a large Rubbermaid tub. Add liquid. Let sit at room temperature for a while, then refrigerate overnight. In the morning, taste and adjust liquor/juice as necessary. Add the citrus fruit, reserving some to add at the last minute. Also a good idea would be freezing some of the grapes so as to keep the sangria cool when serving. Allow to come mostly to room temperature before serving. Serve in small punch-type cups – paper cocktail umbrellas optional. Super tasty, and best when served in front of a sign like this one: