We're planning on living aboard, and are also very health conscious.
Plastic and especially melamine can leech harmful chemicals causing kidney damage, if they are exposed to heat.
So if you do use them, then only use them for cold things, and only wash with cold water.
Risk Evaluation Institute Issues Warning on Melamine : Parentables
Also avoid BPA containing plastic bottles, as the phytoestrogens can disbalance hormones in both men and women.
Corelle is relatively safe as an inert substance.
Though as we are also very environmentally conscious,
we prefer to use biodegradable sustainable dishes,
in our case we use young coconut for bowls and cups.
The also can be handled with hot liquids in them, as husk is insulator.
Young coconuts are usually sold "upside down" in terms that the cone, is actually best as a bottom since it doesn't have natural holes, so we trim off the cone so that the coconut stands flat, and then saw off the flat part to drink the juice and get out the meat.
Depending on if we want to have a cup or a bowl is what decids how much of the flat part we take off, for cups and liquids, just a little bit, and for bowls some more.
when fresh the husk seems large, but we sun dry it, and it gets quite thin.
If it do have excess husk in a cup, then take some off, for a convenient drinking side.
The shape of the coconut cup helps keep liquids in, and the rounded husked bottoms simply roll a bit rather than skid. Can also make a base from the flat top for additional stability.
For utensils we use chopsticks, I simply source sticks from the forest, and make spoons out of clay kilned in a wood fire. Really looking forward to having a woodstove on a boat, to make it more convenient to make pottery. Though since the coconut bowls are almost cups, can simply chop stick the solids, and drink the liquids.
For water we use reverse osmosis, which with a few additional filters can in future work for salt water also.
In the kitchen used to use several knives, but have refined it to just two, one large 5 1/2in and one small 3 1/2 inch survival full tang knives with parachute cord handles, as they are most effective for those hard to cut and peel things like squash. To sharpen I use some flat shale rock I picked up at the side of a river, it's very effective and makes for a sharp smooth finish.
In terms of manual mixing and grinding devices,
we have mortar and pestle, a wooden and a marble one.
Recently we got a manual food processor, which is quite useful also.
Only thing missing is a manual stone mill.