I really want to get messy later on, but I've not really got much except some white emulsion paint and I'm not to sure if it's good to use, I've added it to other mess, but used it on its own, is it ok to use and if so how does it feel.
Do a skin test. Modern low VOC paints won't do much harm to most people with occasional use but long term prolonged exposure (like submerging in it every day for years!) won't be good for anyone (skin and respiratory irritation). Don't drink it.