You sure can. You can take how much you can carry. Only restrictions are that none of those large BBQ grills are allowed but the disposable ones are. Also no glass bottles. Obviously this can be easily hidden away but them are the rules. Keep in mind you have to carry it so make sure you can deal with it.

Also gas cannisters are now banned so we advise taking hexy stove burners instead if you need to warm food up.

All this is for the campsite. What you can take into the arena seems to change on an hourly basis and with each person checking so we can't give a concrete answer on that as yet