My lady friend wants to get messy but she doesn't want to use food as such as it irritates what food stuff or other things can we buy from supermarket to use to get messy I should know answer to this but can't think
The only thing I can think off, that's non-food from a supermarket is shaving foam and kids (washable/poster) paint. The paint can be used on its own (be careful round eyes or eating it). You could also mix it in the shaving foam for coloured pies.
Thats actually quite a difficult question to answer, since everybody's body is different and reacts differently to different things. Some people are a lot lot more sensitive than others.
Have a read of the Spotless Sploshing blog, there's a dedicated section on intrmate care and avoiding irritation.
Bigger supermarkets sometimes sell xantham gum or guar gum, both are used a food thickeners and can make some great slime/gunge too. Use children's poster paint for colouring since its much much less likely to stain than food colouring.
Shaving foam can be good, but it will dry your hair out and make it more brittle- buy some extra conditioner if you use foam. It'll taste pretty bad too (messy play, stuff always gets in your mouth).
Shower soaps/shampoo/conditioner can be good fun, but are very expensive (per litre) and don't taste great. Hand soap/dishwashing soaps tend to be cheaper, but much more aggressive so more likely to cause irritation.
Oil could be an option, but it looks/feels closer to a wetlook rather than a messy section.
My personal recommendation is gunge; order online and have it discreetly delivered. Bentonite clay is also brilliant. Slube is also a very safe bet since it's designed as a sex lube, and each pack makes a full bucket! My partner hasn't had any irritation from gunge (MSgunge), Slube, and clay. We've fucked in it multiple times. Her only complaint is finding brightly coloured goop in her knickers 3 days later as her vagina slowly cleans itself.