I am looking into getting messy for the first time. What are some either food or non-food options that you would recommend for me to try out for myself?
Some of my favorites are syrups, especially corn syrup, which is very sticky, thick, and viscous without (to my nose) as strong a scent as chocolate syrup, molasses, or pancake syrup; it's also super easy to clean off with some warm-to-hot water and simple bar soap.
I also enjoy being doused (or dousing a guy) in room temperature beer. (Unless you have a masochistic streak, I do NOT recommend dousing yourself in cold beer.)
MessySupplies' Clayzee Colours https://www.messysupplies.com/products/clayzee Probably my favourite gunge- very smooth and thick with some of the most vivid and intense colours. (It's bentonite clay with a powder pigment, if you're not in the UK you may want to DIY it due to shipping costs).
Favourite 'messy minigame' is swimsuit filling- the sensation of gunge and mess sliding down inside the suit is incredible, and the way a good swimsuit holds it all around the crotch and butt feels fantastic. 100% recommend giving it a go.
Get an inflatable pool- it'll contain a lot of your mess if you're not doing it in the bath/shower. Dust sheets on all the walls, and tarp the floor if you're not in a bathroom. If you are in the shower then hose the walls down before you start. Your cleanup will become a lot easier.
For easy disposal, scoop your used mess into a bucket (half fill it) and top off with water. Swish your hand through it to break the mess into free-floating suspended lumps and flush it down the toilet. [Toilet pipes are almost impossible to block compared to bath/shower/sink pipes]