Abstract Recently we reported administering a nutritional water supplement (d 0–3) via drinking water (62.5 ml WB/L water) tended to improve final BW, ADG, and G:F of nursery pigs. Supplementation also improved average daily water disappearance (ADWD) for pigs fed simple corn-soybean meal diets. To evaluate the effects of additional amounts of this water supplement (WB; Water Boost, Furst-McNess Company, Freeport, IL), 260 crossbred pigs (5.16 kg BW; 18 d of age) were randomly allotted to four water treatments (7 pens/treatment, 9 to 10 pigs/pen). Water treatments were 0, 31.7, 63.4, and 95.1 ml WB/L water (stock solution) delivered through water medicators (1:128 dilution). Pigs were fed a complex nursery diet without feed-grade antibiotics in four phases (Phase 1: d 0–7, Phase 2: d 7–14, Phase 3: d 14–21, and Phase 4: d 21–42). Water treatments were provided on d 0 – 7. Pigs and feeders were weighed weekly to determine ADG, ADFI, and G:F. Water meters were recorded daily to measure ADWD. Water Boost improved (linear, P < 0.05) ADWD (L/p/d) for d 0 – 21 (2.66, 3.16, 3.21, and 3.16), d 21 – 42 (7.89, 8.58, 8.61, and 9.21), and for the overall period (5.19, 5.76, 5.77, and 6.06). However, there was no difference (P > 0.10) in ADG. Supplementation of WB decreased (quadratic, P < 0.05) ADFI (g/d) for d 21 – 42 (718, 688, 672, and 716), and tended (P < 0.10) to decrease ADFI during the overall period (481, 468, 453, and 484). Supplementation of WB improved (quadratic, P < 0.05) G:F between d 21 – 42 (0.76, 0.80, 0.81, and 0.78) and for the overall period (0.77, 0.80, 0.81, and 0.79). These data suggest supplementing WB for the first 7 d post-weaning improved water intake (16.7%) and G:F (5.2%) for the overall nursery period.