Today's challenge   

September 12th 2013       Balanced Diet
Fill your inventory with 28 different types of food and drink, then eat something.

Previous challenges   

September 1st 2013       Miracle Recovery
Trigger 10 portents of restoration.   

September 2nd 2013       Blood, Sweat and Tears
Gather 200 divine tears on the battlefield.   
 
September 3rd 2013       Everybody Dance Now
Do a dance emote near to at least 10 people who are also dancing.
   
September 4th 2013       Go Bananas!
Eat 50 bananas.   

September 5th 2013       Mad Skills
Train at least 15 different skills in a day.   
 
September 6th 2013       Bulldog
Run from the Wilderness wall to the deep Wilderness wall without dying or teleporting.
   
September 7th 2013       Schmooze
Talk to 10 different signature heroes, kings, queens or rulers.
   
September 8th 2013       Soul Searching
Complete a game of Soul Wars.   

September 9th 2013       Harvest Festival
Cheer in the cabbage field north of Port Sarim when there are no cabbages in it.   

September 10th 2013       There's Always a Bigger Fish
Catch, or assist someone in catching, a big fish during a game of Fish Flingers.   

September 11th 2013       To Forgive is Divine
Harvest from the same wisp as at least 4 other people.

Anyone got the easiest way to do this rofl?

i just bought all the foods i could think of

Managed. Bought all different types of fish, pies, fruit, cup of tea, ales, beer, cup of water, bread.

Lol noob, just go buy 13 different foods from gnome restaurant and them cocktails too.