You should replace PVC by other material like PP or HDPE, PE, glass, wood...
Pure PVC is non toxic, but normal PVC can contain toxic chemical to increase lifetime, reduce cost making...
PVC, uPVC water pipe is food safe but it's usually contain heavy metal that can go out when under heat, pressure and long time using.
Even food safe PVC under sunlight (contain Ultra Violet Ray) will be oxidized and release toxic chemical.
For PP, HDPE, PE You can use solder welding and adjust to the right temperature to join without glue
Glass, ceramic glue: 100ml cow milk + 100ml vinegar and then blend well. In other cup, we fill 2ml water and put in ½ egg-white then blend it. And then pooling the water egg-white solution into the milk cup, blend and add 2g lime and blend. Using this glue by apply on surface, then join and fixing, wait until the glue nearly dry and heat it on flame. Done when the glue dried.
Wood: milk glue, nail