Something you might want to look into is purchasing an old hot plate with the magnetic stirrer function. I used to work in a biochemistry lab and my boss let me have an old one. Heat your water in a glass flask with a thermometer in it (or pour some hot water into any old container), put a magnetic stir bar inside and turn it on, and slowly add your powder. This completely dissolves all solute particles quickly, and you can leave the hot plate on at a constant temperature.(posted 8202 days ago)Cheerio