Labour ade is a drink you make yourself... Here's a recipe i have:

1/3 cup lemon juice (energy)
1/3 cup honey (energy)
1/4-1/2 tsp salt (prevents dehydration)
1/4 tsp baking soda (calms the stomach)
1-2 calcium tablets, with magnesium, crushed (relaxes muscles)

Add enough water to make 1 litre. Add either an additional cup of water or a cup of your favorite juice to flavour.

You sip it after every 2nd or 3rd contraction (or mre if you're thirsty) but some women drink it at the end of PG too. I added a cup of raspberry leaf tea to mine, rather than juice, but if i'm honest i really didn't want to drink or eat during my (very fast) labour.

Bx